How many copies did First Session sell?

An estimated 2k to 4k copies, based on its 89 Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did First Session make?

First Session is free to play, so there is no copy-sales revenue to estimate.

How big is First Session?

Estimated owners: ≈ 2k–4k; from 89 reviews (Very 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 First Session out and predicted the genre from its 8 similar games. Every figure here, including First Session's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 3.0M–4.2M

best case 7.9M (DARK SOULS™ II: Scholar of the First Sin)

The Atmospheric lane

A big, proven genre: most sell around 3.6M copies.

A typical game

≈ 3.6M copies

≈ $38.9M after Steam's cut

from ~76k reviews

Best case

≈ 7.9M copies

DARK SOULS™ II: Scholar of the First Sin · ≈ $122.6M after Steam's cut

from 130k 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 Souls-like + Dark Fantasy, priced around $40.
None of the games you compared shipped in the last two years; the newest is from 2019. 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
Getting Over It with Bennett Foddy 2017	Est. copies ≈ 2.8M–4.6M SteamSpy 2M–5M	Est. revenue $6.2M–$16.6M net $11.3M–$25.6M gross	$7.99	82k reviews Very Positive	Psychological HorrorDifficult +6
DARK SOULS™ II: Scholar of the First Sin 2015	Est. copies ≈ 6.0M–9.8M 1.7x vs typical SteamSpy 2M–5M	Est. revenue $66.5M–$178.7M net $120.8M–$274.9M gross	$39.99	130k reviews Very Positive	Souls-likeDark Fantasy +6
SOMA 2015	Est. copies ≈ 2.4M–3.9M SteamSpy 2M–5M	Est. revenue $19.8M–$53.2M net $36.0M–$81.9M gross	$29.99	52k reviews Overwhelmingly Positive	HorrorPsychological Horror +6
INSIDE 2016	Est. copies ≈ 3.0M–4.9M SteamSpy 2M–5M	Est. revenue $20.6M–$55.4M net $37.4M–$85.2M gross	$24.99	75k reviews Overwhelmingly Positive	2.5DPuzzle-Platformer +6
Firewatch 2016	Est. copies ≈ 3.9M–6.4M SteamSpy 2M–5M	Est. revenue $21.6M–$58.1M net $39.3M–$89.4M gross	$19.99	98k reviews Very Positive	AdventureAtmospheric +6
Hellblade: Senua's Sacrifice 2017	Est. copies ≈ 2.6M–4.3M SteamSpy 2M–5M	Est. revenue $21.6M–$58.1M net $39.3M–$89.4M gross	$29.99	76k reviews Very Positive	AtmosphericPsychological +6
What Remains of Edith Finch 2017	Est. copies ≈ 1.8M–2.9M SteamSpy 500k–1M	Est. revenue $9.7M–$26.2M net $17.7M–$40.3M gross	$19.99	52k reviews Overwhelmingly Positive	Story RichAtmospheric +6
A Plague Tale: Innocence 2019	Est. copies ≈ 2.0M–3.2M SteamSpy 1M–2M	Est. revenue $21.7M–$58.5M net $39.5M–$89.9M gross	$39.99	69k reviews Very Positive	Story RichAdventure +6