How many copies did Altitude sell?

101k to 164k copies, based on its 2k Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did Altitude make?

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

How big is Altitude?

Estimated owners: ≈ 101k–164k; from 2k 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 Altitude out and predicted the genre from its 8 similar games. Every figure here, including Altitude's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 50–444

best case 52.4M (War Thunder)

The Side Scroller genre

1 of your 8 similar games is a hit. A niche genre: plan for a small audience.

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

A typical game

≈ 50–444 copies

≈ $107–$379 after Steam's cut

from ~3 reviews

Best case

≈ 40.0M–64.9M copies

War Thunder

A breakout hit, far above a typical game.

The genre you'd be entering

The launch: The games that made it here had under 15 reviews in their first month.; Under about 100 in month one, almost nothing recovers.
Your set: Your set clusters on Side Scroller (6 of 8) and Flight (5 of 8).
The winners: Winners here lead with Simulation + Vehicular Combat. The breakout hits carry Free to Play + Simulation + Vehicular Combat; a typical game here doesn't.
The era: The games you compared span 2013 to 2022, a genre with a long track record.

Copies and revenue are rough lifetime estimates from the review count.

Similar games

Game	Est. copies	Est. revenue	Price	Reviews	Tags
Farlight Commanders: Prologue 2021	Est. copies ≈ 570–927 7.7x vs typical SteamSpy under 20k	Est. revenue Free	Free	23 reviews Mostly Positive	Side ScrollerShooter
War Thunder 2013	Est. copies ≈ 40.0M–64.9M 256155x vs typical SteamSpy 20M–50M	Est. revenue Free	Free	768k reviews Mostly Positive	Free to PlaySimulation
Space Crisis 2020	Est. copies ≈ 26–43 SteamSpy under 20k	Est. revenue $57–$156 after Steam's cut $104–$240 before the cut	$7.99	1 reviews 1 user reviews	Side ScrollerFlight
MagicalGirl Mimi 2020	Est. copies ≈ 26–43 SteamSpy under 20k	Est. revenue $57–$156 after Steam's cut $104–$240 before the cut	$7.99	1 reviews 1 user reviews	Action RoguelikeFlight
Abiko The Miko 2020	Est. copies ≈ 106–172 SteamSpy under 20k	Est. revenue $233–$625 after Steam's cut $423–$962 before the cut	$7.99	4 reviews 4 user reviews	Action RoguelikeExploration
COCKEYED HELICOPTERS 2021	Est. copies ≈ 50–81 SteamSpy under 20k	Est. revenue $124–$332 after Steam's cut $225–$510 before the cut	$8.99	2 reviews 2 user reviews	ActionCasual
Penetrator 2022	Est. copies ≈ 72–117 SteamSpy under 20k	Est. revenue $40–$106 after Steam's cut $72–$163 before the cut	$1.99	3 reviews 3 user reviews	Side ScrollerShoot 'Em Up
Pier Pressure 2020	Est. copies ≈ 766–1k 9.7x vs typical SteamSpy under 20k	Est. revenue $1k–$3k after Steam's cut $2k–$4k before the cut	$4.99	29 reviews Positive	ActionArcade