The Game Census
Idle Monster TD cover art

Idle Monster TD

Swell Games LLC · 2021-06-20

Steam

CasualFree To PlayIndieStrategy

Modes: Single player · Perspectives: Bird view / Isometric

Releases: Mar 29, 2020 (Web browser), Dec 17, 2020 (PC (Microsoft Windows)), Oct 28, 2020 (Android), Apr 22, 2020 (iOS)

An endless Tower Defense game of epic Monsters vs evil War Machines. Unlock and upgrade tons of unique elemental Monsters (Water, Air, Earth, and Fire) to defend your home from an infinite swarm of robots. Strategize the most effective placement of Monsters to synergize their elemental abilities.

Idle Monster TD is a free-to-play Casual Indie Strategy game released in 2021, with an estimated 100,000 .. 200,000 owners and a Mostly Positive review sentiment (72% of 855 reviews).

32
playing now
72%
positive of 855 reviews
Mostly Positive
steam's rating (official)
100,000–200,000
owners (SteamSpy est.)
platinum
deck/linux tier (ProtonDB)
Playable
Steam Deck (Valve)
SteamOS: Playable
Free
steam price (US)

32 players in-game as of 2026-10-14 15:00 UTC (census sample)

Health check

Quietly active
  • · 32 players in-game at the last census sample.
  • · 24 reviews in the last 8 weeks (~3/week).
  • · Review velocity down 25% vs the prior 8 weeks.
  • · Current weekly pace is under 5% of the all-time peak week (129 reviews).
  • · Top 9% of 29,131 Casual games in the census by review count.

Health tier since 2026-08-31

Review momentum

PositiveNegative
939320202026Week of 2020-12-01: 56 positiveWeek of 2020-12-01: 19 negativeWeek of 2021-01-01: 93 positiveWeek of 2021-01-01: 36 negativeWeek of 2021-02-01: 57 positiveWeek of 2021-02-01: 18 negativeWeek of 2021-03-01: 29 positiveWeek of 2021-03-01: 14 negativeWeek of 2021-04-01: 21 positiveWeek of 2021-04-01: 8 negativeWeek of 2021-05-01: 20 positiveWeek of 2021-05-01: 4 negativeWeek of 2021-06-01: 31 positiveWeek of 2021-06-01: 10 negativeWeek of 2021-07-01: 38 positiveWeek of 2021-07-01: 24 negativeWeek of 2021-08-01: 36 positiveWeek of 2021-08-01: 8 negativeWeek of 2021-09-01: 28 positiveWeek of 2021-09-01: 5 negativeWeek of 2021-10-01: 8 positiveWeek of 2021-10-01: 4 negativeWeek of 2021-11-01: 44 positiveWeek of 2021-11-01: 7 negativeWeek of 2021-12-01: 8 positiveWeek of 2021-12-01: 4 negativeWeek of 2022-01-01: 13 positiveWeek of 2022-01-01: 3 negativeWeek of 2022-02-01: 10 positiveWeek of 2022-02-01: 5 negativeWeek of 2022-03-01: 5 positiveWeek of 2022-03-01: 4 negativeWeek of 2022-04-01: 5 positiveWeek of 2022-04-01: 2 negativeWeek of 2022-05-01: 2 positiveWeek of 2022-05-01: 2 negativeWeek of 2022-06-01: 6 positiveWeek of 2022-06-01: 2 negativeWeek of 2022-07-01: 7 positiveWeek of 2022-07-01: 2 negativeWeek of 2022-08-01: 7 positiveWeek of 2022-08-01: 4 negativeWeek of 2022-09-01: 3 positiveWeek of 2022-09-01: 3 negativeWeek of 2022-10-01: 3 positiveWeek of 2022-10-01: 4 negativeWeek of 2022-11-01: 4 positiveWeek of 2022-12-01: 3 positiveWeek of 2022-12-01: 1 negativeWeek of 2023-01-01: 2 positiveWeek of 2023-01-01: 2 negativeWeek of 2023-02-01: 1 positiveWeek of 2023-03-01: 3 positiveWeek of 2023-04-01: 2 positiveWeek of 2023-04-01: 1 negativeWeek of 2023-05-01: 3 positiveWeek of 2023-05-01: 4 negativeWeek of 2023-06-01: 2 positiveWeek of 2023-06-01: 2 negativeWeek of 2023-07-01: 2 negativeWeek of 2023-08-01: 1 positiveWeek of 2023-08-01: 1 negativeWeek of 2023-09-01: 3 positiveWeek of 2023-09-01: 1 negativeWeek of 2023-10-01: 3 positiveWeek of 2023-10-01: 1 negativeWeek of 2023-11-01: 3 positiveWeek of 2023-11-01: 3 negativeWeek of 2023-12-01: 3 positiveWeek of 2023-12-01: 1 negativeWeek of 2024-01-01: 12 positiveWeek of 2024-02-01: 5 positiveWeek of 2024-02-01: 1 negativeWeek of 2024-03-01: 2 positiveWeek of 2024-04-01: 6 positiveWeek of 2024-05-01: 4 positiveWeek of 2024-05-01: 3 negativeWeek of 2024-06-01: 2 positiveWeek of 2024-06-01: 1 negativeWeek of 2024-07-01: 4 positiveWeek of 2024-07-01: 4 negativeWeek of 2024-08-01: 10 positiveWeek of 2024-08-01: 2 negativeWeek of 2024-09-01: 5 positiveWeek of 2024-09-01: 2 negativeWeek of 2024-10-01: 9 positiveWeek of 2024-10-01: 2 negativeWeek of 2024-11-01: 5 positiveWeek of 2024-11-01: 3 negativeWeek of 2024-12-01: 3 positiveWeek of 2024-12-01: 2 negativeWeek of 2025-01-01: 2 positiveWeek of 2025-01-01: 2 negativeWeek of 2025-03-01: 1 positiveWeek of 2025-03-01: 3 negativeWeek of 2025-04-01: 4 positiveWeek of 2025-04-01: 1 negativeWeek of 2025-05-01: 3 positiveWeek of 2025-06-01: 2 positiveWeek of 2025-07-01: 5 positiveWeek of 2025-07-01: 1 negativeWeek of 2025-08-01: 4 positiveWeek of 2025-08-01: 3 negativeWeek of 2025-09-01: 1 positiveWeek of 2025-10-01: 4 positiveWeek of 2025-10-01: 1 negativeWeek of 2025-11-01: 3 positiveWeek of 2025-12-01: 2 positiveWeek of 2026-01-01: 2 positiveWeek of 2026-01-01: 2 negativeWeek of 2026-02-01: 1 negativeWeek of 2026-03-01: 2 positiveWeek of 2026-04-01: 5 positiveWeek of 2026-04-01: 2 negativeWeek of 2026-05-01: 3 positiveWeek of 2026-05-01: 1 negativeWeek of 2026-06-01: 2 positiveWeek of 2026-06-01: 1 negativeWeek of 2026-07-01: 1 positiveWeek of 2026-08-01: 1 positiveWeek of 2026-08-01: 1 negative
Weekly review counts (Steam review histogram). Positive above the line, negative below.

Players online

32142026-09-15 01:00 — 19 players2026-09-16 09:00 — 23 players2026-09-17 16:00 — 24 players2026-09-19 00:00 — 18 players2026-09-20 07:00 — 23 players2026-09-21 15:00 — 23 players2026-09-22 23:00 — 20 players2026-09-24 06:00 — 28 players2026-09-25 14:00 — 21 players2026-09-26 21:00 — 23 players2026-09-28 05:00 — 20 players2026-09-29 12:00 — 24 players2026-09-30 20:00 — 22 players2026-10-02 03:00 — 19 players2026-10-03 11:00 — 28 players2026-10-04 19:00 — 22 players2026-10-06 02:00 — 23 players2026-10-07 10:00 — 20 players2026-10-08 17:00 — 21 players2026-10-10 01:00 — 19 players2026-10-11 08:00 — 23 players2026-10-12 16:00 — 23 players2026-10-14 00:00 — 26 players2026-10-14 15:00 — 32 players
Concurrent players, hourly average, last 30 days (census samples).
89026Dec 2020Aug 2026Dec 2020 — avg 568 · peak 735Feb 2021 — avg 890 · peak 1,088Apr 2021 — avg 524 · peak 675Jun 2021 — avg 423 · peak 703Aug 2021 — avg 567 · peak 686Oct 2021 — avg 397 · peak 509Dec 2021 — avg 257 · peak 342Feb 2022 — avg 215 · peak 276Apr 2022 — avg 173 · peak 224Jun 2022 — avg 159 · peak 207Aug 2022 — avg 137 · peak 170Oct 2022 — avg 106 · peak 147Dec 2022 — avg 85 · peak 120Feb 2023 — avg 68 · peak 90Apr 2023 — avg 63 · peak 88Jun 2023 — avg 64 · peak 82Aug 2023 — avg 65 · peak 87Oct 2023 — avg 57 · peak 75Dec 2023 — avg 59 · peak 84Feb 2024 — avg 72 · peak 98Apr 2024 — avg 67 · peak 95Jun 2024 — avg 57 · peak 75Aug 2024 — avg 62 · peak 79Oct 2024 — avg 55 · peak 73Dec 2024 — avg 49 · peak 66Feb 2025 — avg 63 · peak 80Apr 2025 — avg 57 · peak 80Jun 2025 — avg 46 · peak 66Aug 2025 — avg 41 · peak 59Oct 2025 — avg 44 · peak 61Dec 2025 — avg 35 · peak 56Feb 2026 — avg 26 · peak 40Apr 2026 — avg 31 · peak 49Jun 2026 — avg 33 · peak 49Aug 2026 — avg 28 · peak 40
Monthly average players (source: steamcharts.com) — history via steamcharts.com; live census sampling since Aug 2026.

Completion

24
achievements tracked
49.1%
earned "Respected"
8.6%
median achievement earned by

Global achievement rates from Steam.

Details

WindowsmacOSSingle-playerSteam AchievementsIn-App PurchasesStatsFamily Sharing

1 supported languages: English

Console footprint

PlatformPlayers trackedCompletionTrophies/achievements
Steam (Steam)1,6773%24

Players tracked by Exophase (achievement/trophy trackers) — a sample of the player base, not total sales.

Player tags

2DCuteIdlerCasualCombatClickerFantasyColorfulStrategyAutomation

Census log

Computed from census-recorded observations only — dates are observation dates.

Players also track

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Similarity via IGDB.

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