The Game Census
Sylphy and the Sleepless Island cover art

Sylphy and the Sleepless Island

Milky Way · Kagura Games · 2021-10-08

SteamGOG

ActionAdventureIndieRPGSimulation

Modes: Single player

Releases: Oct 09, 2021 (PC (Microsoft Windows))

One day, professional thief Sylphy learns of the mystical and valuable artifact of the Kingdom of Diezel, but the mission goes sideways and she ends up robbing the island of its night! She has one week to right her wrongs in this action-filled RPG!

Sylphy and the Sleepless Island is an Action, Adventure, Indie, and RPG game priced at $19.99, released in 2021 with an owner estimate of 20,000 .. 50,000, holding a Very Positive review sentiment (89% of 185 reviews).

0
playing now
89%
positive of 185 reviews
Very Positive
steam's rating (official)
20,000–50,000
owners (SteamSpy est.)
pending
deck/linux tier (ProtonDB)
Playable
Steam Deck (Valve)
SteamOS: Playable
$19.99
steam price (US)

0 players in-game as of 2026-10-14 07:00 UTC (census sample)

Sylphy works hard as a thief to support her sickly sister as they eke out a meager life in the slums. One day, Sylphy learns of an incredibly rare and powerful treasure that could be the answer to all of their problems: The Orb of the Abyss. The Orb is locked away in a vault within the Kingdom of Diezel, a land of spirits and spirit worship. But Sylphy’s in luck because Diezel is kicking off a week-long Spirit Festival! She comes to Diezel with dreams of riches, but when the mission goes sideways, Sylphy finds herself a criminal and slave of Diezel. Her only hope of freedom is to help save the(Storyline via IGDB)

Health check

Quiet
  • · 0 players in-game at the last census sample.
  • · 12 reviews in the last 8 weeks (~2/week).
  • · Review velocity down 14% vs the prior 8 weeks.
  • · Current weekly pace is under 5% of the all-time peak week (68 reviews).
  • · Top 30% of 27,649 Action games in the census by review count.

Health tier since 2026-09-01

Estimated sales: 3.7k–8.3k copies

Review-multiple estimate from 185 total reviews — how this is computed.

Current store prices

GOG$14.99-25%

Deal snapshots via CheapShark, refreshed daily.

All-time low: $11.99 at Steam (2026-09-13)via IsThereAnyDeal

12-month high $19.99 · on sale 65 of 90 observed days · $3.00 above the all-time low (census price snapshots)

Review momentum

PositiveNegative
636320212026Week of 2021-10-01: 63 positiveWeek of 2021-10-01: 5 negativeWeek of 2021-11-01: 21 positiveWeek of 2021-11-01: 1 negativeWeek of 2021-12-01: 8 positiveWeek of 2022-01-01: 5 positiveWeek of 2022-01-01: 1 negativeWeek of 2022-02-01: 2 positiveWeek of 2022-02-01: 2 negativeWeek of 2022-03-01: 2 positiveWeek of 2022-03-01: 2 negativeWeek of 2022-04-01: 1 negativeWeek of 2022-06-01: 1 positiveWeek of 2022-07-01: 2 positiveWeek of 2022-08-01: 2 positiveWeek of 2022-09-01: 1 positiveWeek of 2022-09-01: 1 negativeWeek of 2022-10-01: 1 positiveWeek of 2022-11-01: 1 positiveWeek of 2022-12-01: 2 positiveWeek of 2022-12-01: 1 negativeWeek of 2023-01-01: 4 positiveWeek of 2023-02-01: 1 positiveWeek of 2023-03-01: 1 positiveWeek of 2023-04-01: 1 positiveWeek of 2023-04-01: 1 negativeWeek of 2023-05-01: 1 positiveWeek of 2023-06-01: 1 positiveWeek of 2023-08-01: 2 negativeWeek of 2023-09-01: 1 positiveWeek of 2023-12-01: 2 positiveWeek of 2024-01-01: 4 positiveWeek of 2024-01-01: 1 negativeWeek of 2024-03-01: 1 positiveWeek of 2024-05-01: 3 positiveWeek of 2024-06-01: 1 negativeWeek of 2024-07-01: 1 positiveWeek of 2024-07-01: 1 negativeWeek of 2024-09-01: 2 positiveWeek of 2024-10-01: 1 positiveWeek of 2024-11-01: 1 positiveWeek of 2024-12-01: 1 positiveWeek of 2025-01-01: 1 positiveWeek of 2025-03-01: 2 positiveWeek of 2025-04-01: 4 positiveWeek of 2025-05-01: 2 positiveWeek of 2025-06-01: 1 positiveWeek of 2025-07-01: 2 positiveWeek of 2025-08-01: 2 negativeWeek of 2025-10-01: 1 positiveWeek of 2025-11-01: 1 positiveWeek of 2026-03-01: 1 positiveWeek of 2026-05-01: 2 positiveWeek of 2026-07-01: 2 positive
Weekly review counts (Steam review histogram). Positive above the line, negative below.

Players online

402026-09-15 08:00 — 1 players2026-09-16 16:00 — 1 players2026-09-18 00:00 — 0 players2026-09-19 07:00 — 1 players2026-09-20 15:00 — 1 players2026-09-21 23:00 — 0 players2026-09-23 06:00 — 0 players2026-09-24 14:00 — 1 players2026-09-25 21:00 — 1 players2026-09-27 05:00 — 1 players2026-09-28 12:00 — 2 players2026-09-29 20:00 — 3 players2026-10-01 03:00 — 1 players2026-10-02 11:00 — 3 players2026-10-03 18:00 — 1 players2026-10-05 02:00 — 1 players2026-10-06 10:00 — 1 players2026-10-07 17:00 — 1 players2026-10-09 01:00 — 1 players2026-10-10 08:00 — 0 players2026-10-11 16:00 — 3 players2026-10-13 00:00 — 0 players2026-10-14 07:00 — 0 players
Concurrent players, hourly average, last 30 days (census samples).
581Oct 2021Jan 2024Oct 2021 — avg 58 · peak 293Nov 2021 — avg 11 · peak 30Dec 2021 — avg 6 · peak 16Jan 2022 — avg 5 · peak 12Feb 2022 — avg 4 · peak 12Mar 2022 — avg 3 · peak 9Apr 2022 — avg 3 · peak 10May 2022 — avg 3 · peak 9Jun 2022 — avg 3 · peak 8Jul 2022 — avg 3 · peak 9Aug 2022 — avg 3 · peak 14Sep 2022 — avg 2 · peak 6Oct 2022 — avg 3 · peak 8Nov 2022 — avg 3 · peak 8Dec 2022 — avg 2 · peak 8Jan 2023 — avg 3 · peak 9Feb 2023 — avg 2 · peak 7Mar 2023 — avg 2 · peak 5Apr 2023 — avg 2 · peak 4May 2023 — avg 2 · peak 7Jul 2023 — avg 2 · peak 6Aug 2023 — avg 1 · peak 6Sep 2023 — avg 2 · peak 5Dec 2023 — avg 2 · peak 6Jan 2024 — avg 2 · peak 7
Monthly average players (source: steamcharts.com) — history via steamcharts.com; live census sampling since Aug 2026.

Price history

$19.99$14.992021-10-092026-10-142021-10-09 — best price $17.992022-02-14 — best price $15.992022-08-08 — best price $15.992022-12-23 — best price $15.992023-02-20 — best price $19.992023-05-26 — best price $19.992023-08-01 — best price $19.992023-11-21 — best price $14.992024-01-12 — best price $19.992024-02-22 — best price $19.992024-04-11 — best price $19.992024-06-19 — best price $14.992024-08-26 — best price $14.992024-10-15 — best price $19.992024-11-26 — best price $14.992025-02-15 — best price $14.992025-04-17 — best price $14.992025-06-10 — best price $14.992025-08-13 — best price $14.992025-09-25 — best price $14.992025-11-05 — best price $19.992026-01-05 — best price $19.992026-03-05 — best price $19.992026-05-01 — best price $14.992026-06-17 — best price $14.992026-08-24 — best price $14.992026-09-06 — best price $14.992026-09-14 — best price $19.992026-09-22 — best price $14.992026-09-30 — best price $14.992026-10-08 — best price $14.992026-10-14 — best price $14.99
Lowest recorded price across tracked stores, per day (census snapshots).

Details

WindowsSingle-playerSteam Trading CardsSteam CloudFamily Sharing

3 supported languages: English, Japanese, Simplified Chinese

Player tags

RPGJRPGAnimeIndieMemesActionHentaiMatureNudityRPGMaker

Census log

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

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Similarity via IGDB.

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