How much revenue did Islets make?

An estimated 314k to 844k net after Steam's roughly 30% cut, derived from the copies estimate and its price.

How many copies did Islets sell?

Q: How many copies did Islets sell?

An estimated 57k to 93k copies, based on its 2k Steam reviews. This is a labeled estimate from the review count, not exact sales.

Estimated copies sold: ≈ 57k–93k; $314k–$844k net $570k–$1.3M gross; from 2k reviews (Overwhelmingly Positive)

A labeled estimate from the public review count (adjusted for release year), not exact sales. Owner data cross-checked with SteamSpy.

Does this actually work?

We left Islets out and predicted the genre from its 4 similar games. Every figure here, including Islets's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 1.2M–8.1M

best case 24.8M (Hollow Knight)

The Metroidvania lane

A big, proven genre: most sell around 2.0M copies. From a small set, so take it as a sketch.

A typical game

≈ 2.0M copies

≈ $19.0M after Steam's cut

from ~55k reviews

Best case

≈ 24.8M copies

Hollow Knight · ≈ $143.7M after Steam's cut

from 550k reviews

Copies and revenue are rough lifetime estimates from the review count; typical figures are medians per column, so they can come from different games.

The lane you'd be entering

Winners here lead with Metroidvania + Souls-like, priced around $15.
None of the games you compared shipped in the last two years; the newest is from 2021. That says more about your picks than about the market, so add newer similar games to read the timing.
A typical game here lands in Diamond ($1M+ before Steam's cut, est.). Tiers: Chris Zukowski's benchmark tiers.

Similar games

Game	Price	Reviews	Tags	Est. copies	Est. revenue
Hollow Knight 2017	Est. copies ≈ 18.9M–30.7M 10.0x vs typical SteamSpy 5M–10M	Est. revenue $77.9M–$209.5M net $141.7M–$322.4M gross	$14.99	550k reviews Overwhelmingly Positive	MetroidvaniaSouls-like +6
GRIME 2021	Est. copies ≈ 165k–267k SteamSpy 200k–500k	Est. revenue $1.1M–$3.0M net $2.1M–$4.7M gross	$24.99	7k reviews Very Positive	MetroidvaniaSouls-like +6
Blasphemous 2019	Est. copies ≈ 1.9M–3.1M SteamSpy 1M–2M	Est. revenue $12.9M–$34.7M net $23.5M–$53.4M gross	$24.99	65k reviews Very Positive	MetroidvaniaPixel Graphics +6
ENDER LILIES: Quietus of the Knights 2021	Est. copies ≈ 1.1M–1.8M SteamSpy 1M–2M	Est. revenue $7.7M–$20.7M net $14.0M–$31.8M gross	$24.99	45k reviews Very Positive	MetroidvaniaFemale Protagonist +6