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How many copies did Fantasy Aquarium sell?

Estimated copies sold
≈ 25k–41k
$48k–$130k after Steam's cut $88k–$199k before Steam's cut
from 1k reviews (Mostly 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 Fantasy Aquarium and predicted how it would do from its 8 similar games. Every figure here, including Fantasy Aquarium's, is estimated from Steam reviews.

Copies, estimated from reviews

typical (middle half) 100k–930k
best case 4.0M (Clicker Heroes)
Games like Fantasy Aquarium

A typical game among these

≈ 100k–930k copies

from ~5k reviews

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

6 of the 8 similar games are hits.

Best case: Clicker Heroes at ≈ 3.0M–4.9M copies.

What their first month looked like
About half the games that made it here had over 3k reviews in their first month; the range was 111 to 26k.
The genre you'd be entering
These games
The similar games share Clicker (8 of 8) and Idler (5 of 8).
The winners
Winners here lead with Clicker + Idler.
When they shipped
The similar games span 2015 to 2025, and 1 of the 8 shipped in the last two years.
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 61 for the oldest, then widened into a range; revenue rides on that estimate times price. Source: GameDiscoverCo (2020) and VG Insights (2021).

Similar games

IdleOn - The Incremental MMO
2025
Est. copies
≈ 741k–1.2M
6.3x vs typical
SteamSpy 1M–2M
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Free
Free
30k reviews
Mostly Positive
IdlerPixel Graphics
Endless World Idle RPG
2019
Est. copies
≈ 122k–198k
SteamSpy 20k–50k
Est. revenue
Free
Free
4k reviews
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PvPHack and Slash
Clicker Heroes
2015
Est. copies
≈ 3.0M–4.9M
13x vs typical
SteamSpy 5M–10M
Est. revenue
Free
Free
62k reviews
Very Positive
ClickerIdler
Sakura Clicker
2015
Est. copies
≈ 698k–1.1M
3.0x vs typical
SteamSpy 1M–2M
Est. revenue
Free
Free
14k reviews
Very Positive
NudityFree to Play
Idle Big Devil
2021
Est. copies
≈ 94k–154k
SteamSpy 500k–1M
Est. revenue
Free
Free
4k reviews
Very Positive
Free to PlayStrategy
Shonen Idle Z
2016
Est. copies
≈ 22k–37k
SteamSpy 100k–200k
Est. revenue
Free
Free
540 reviews
Mixed
Free to PlayClicker
MONMUSU
2018
Est. copies
≈ 160k–259k
SteamSpy 500k–1M
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Free
Free
5k reviews
Very Positive
Sexual ContentNudity
SPACE / MECH / PILOT
2020
Est. copies
≈ 12k–19k
SteamSpy under 20k
Est. revenue
Free
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479 reviews
Very Positive
RPGClicker

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