How many copies did EMPTY SHELL: PROLOGUE sell?

35k to 57k copies, based on its 1k Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did EMPTY SHELL: PROLOGUE make?

EMPTY SHELL: PROLOGUE is free to play, so there is no copy-sales revenue to estimate.

How big is EMPTY SHELL: PROLOGUE?

Estimated players who have it: ≈ 35k–57k; from 1k reviews (Very Positive)

Copies are estimated from the public review count, adjusted for release year, and cross-checked against SteamSpy's own estimate.

Did the prediction match what actually happened?

We hid EMPTY SHELL: PROLOGUE and predicted how it would do from its 8 similar games. Every figure here, including EMPTY SHELL: PROLOGUE's, is estimated from Steam reviews.

Copies, estimated from reviews

typical (middle half) 1000k–2.1M

best case 5.2M (The Binding of Isaac)

Games like EMPTY SHELL: PROLOGUE

A typical game among these

≈ 1000k–2.1M copies

≈ $4.7M–$9.2M after Steam's cut

from ~36k reviews

Only the top fifth of 2019's Steam releases earned $34k or more before Steam's cut, so plan for that or less.

All 8 of the similar games are hits.

Best case: The Binding of Isaac at ≈ 4.0M–6.5M copies, ≈ $5.5M–$14.7M after Steam's cut.

What their first month looked like

About half the games that made it here had over 23k reviews in their first month; the range was 10k to 41k.

The genre you'd be entering

These games: The similar games share Action Roguelike (8 of 8) and Rogue-like (6 of 8).
The winners: Winners here lead with Action Roguelike + Rogue-like, priced around $5.
When they shipped: 4 of the 8 similar games shipped in the last two years, so this genre is actively shipping.

How these numbers were worked out

A hit here: 1,000+ reviews, roughly $150k+ before Steam's cut (a standard indie benchmark).

Copies come from each game's reviews times a sales-per-review rate that falls with release age, from about 31 for the most recent game here to about 79 for the oldest, then widened into a range; revenue rides on that estimate times price. Source: GameDiscoverCo (2020) and VG Insights (2021).

Similar games

Game	Est. copies	Est. revenue	Price	Reviews	Tags
The Binding of Isaac 2011	Est. copies ≈ 4.0M–6.5M 1.8x vs typical SteamSpy 1M–2M	Est. revenue $5.5M–$14.7M after Steam's cut $9.9M–$22.6M before Steam's cut	$4.99	63k reviews Very Positive	Action RoguelikeRogue-like
Soulstone Survivors 2025	Est. copies ≈ 668k–1.1M SteamSpy 500k–1M	Est. revenue $2.8M–$7.4M after Steam's cut $5.0M–$11.4M before Steam's cut	$14.99	27k reviews Very Positive	Action RoguelikeBullet Hell
Halls of Torment 2024	Est. copies ≈ 793k–1.3M SteamSpy 500k–1M	Est. revenue $1.5M–$3.9M after Steam's cut $2.6M–$6.0M before Steam's cut	$6.66	32k reviews Overwhelmingly Positive	Action RoguelikeRogue-lite
Nuclear Throne 2015	Est. copies ≈ 967k–1.6M SteamSpy 500k–1M	Est. revenue $3.2M–$8.6M after Steam's cut $5.8M–$13.2M before Steam's cut	$11.99	20k reviews Overwhelmingly Positive	Action RoguelikeRogue-like
Hero Siege 2014	Est. copies ≈ 2.7M–4.4M SteamSpy 1M–2M	Est. revenue $5.9M–$15.8M after Steam's cut $10.7M–$24.4M before Steam's cut	$7.99	48k reviews Mixed	Action RPGPixel Graphics
Magicraft 2024	Est. copies ≈ 419k–681k SteamSpy 500k–1M	Est. revenue $1.8M–$5.0M after Steam's cut $3.4M–$7.6M before Steam's cut	$15.99	17k reviews Very Positive	Action RoguelikeRogue-lite
Deep Rock Galactic: Survivor 2025	Est. copies ≈ 1.2M–2.0M SteamSpy 1M–2M	Est. revenue $4.3M–$11.6M after Steam's cut $7.8M–$17.8M before Steam's cut	$12.99	49k reviews Very Positive	DwarfAction Roguelike
暖雪 Warm Snow 2022	Est. copies ≈ 971k–1.6M SteamSpy 1M–2M	Est. revenue $4.8M–$12.9M after Steam's cut $8.7M–$19.9M before Steam's cut	$17.99	39k reviews Very Positive	Action RoguelikeRogue-lite