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CosmoDreamer

CosmoDreamer

From the popular free game "Outside" comes a dreamy and cute barrage shmups. The visuals are colorful, cute and fantastic, and the game features active gameplay.

Released Oct 2, 2020 Developer あうとさいど Platforms Windows Bullet HellActionTop-Down Shooter2D PlatformerShooter
View on Steam ↗ $7.99 (US · as of 2026-05-18)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-28.

100.0%positive149 reviews
Recommended · 1 found this helpful

“Bought this game as my first shmup. I'm pretty terrible at video games in general but this game's casual mode is casual enough (but not a breeze) that even I can actually have fun.”

— a player, Steam review · 6 hrs played
Recommended · 0 found this helpful

“Was not expecting this to be such a good shmup game when looking at this games visual aesthetic, but boy was I wrong. Don't let the cutesy nature of the game fool you. I'm at this time trying to beat all levels on the Expert difficulty and the difficulty spike is pretty insane.…”

— a player, Steam review · 3 hrs played
Read more reviews ↗

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-09-28.

40achievements
28.3%median completion
1.8%rarest: Achievement Master!
83.0% of players 79.3% of players 78.7% of players 75.9% of players 74.9% of players 71.5% of players 70.0% of players 66.7% of players 66.6% of players 65.9% of players 61.8% of players 60.1% of players 55.9% of players 44.1% of players 42.6% of players 41.1% of players 40.2% of players 36.8% of players 36.0% of players 33.0% of players 28.3% of players 28.2% of players 27.4% of players 27.4% of players 22.9% of players 22.5% of players 21.5% of players 20.7% of players 18.3% of players 15.5% of players 12.3% of players 11.1% of players 9.3% of players 8.7% of players 8.1% of players 6.3% of players 5.4% of players 4.0% of players 2.6% of players 1.8% of players 83.0% 0% most earned rarest
Almost everyone has
83.0%Snowy Hometown — You completed Powdery Snow Dream!
79.3%Walking on Thin Ice — You grazed past 200 enemy bullets total!
78.7%Shooting Star Sky — You completed Shooting Star Dream
Rarest badges of honor
1.8%Achievement Master! — You got all the achievements! Congrats!!!
2.6%Dream Destroyer — You completed Deepest Dream in the Trial in Nightmare Mode!
4.0%Dream Trekker — You completed the Trial in Nightmare Mode!

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Sep 12, 2025
“Cosmo Dreamer” Ver2.31 Update

Thank you for playing Cosmo Dreamer. We are pleased to announce the Ver2.31 update for Cosmo Dreamer. In this version, the following changes have been made: ・Adjusted the replay and ranking UI when us

Sep 11, 2025
“Cosmo Dreamer” Ver2.30 Update

Thank you for playing Cosmo Dreamer. We are pleased to announce the Ver2.30 update for Cosmo Dreamer. In this version, the following changes have been made: ・Added support for Simplified and Tradition

Aug 11, 2025
New "Fox Flare Night" Demo Release

We at Outside are excited to announce the release of the demo version of our new STG, Fox Flare Night ! Store Page Here This is Outside’s first side-view shooting game, offering a refreshing, fast-pac

Oct 04, 2024
"Cosmo Dreamer" Ver. 2.24 update

Thank you for playing Cosmo Dreamer. We are pleased to announce the Ver. 2.24 update of Cosmo Dreamer. In this version, we have made the following changes. ・VSYNC (vertical sync)” and ‘SOUND TYPE (sou

Jun 21, 2024
New "REDNEG ALLSTARS SWING-BY EDITION" has been released!

Thank you for your interest in Cosmo Dreamer. We are pleased to announce that Outside new shump "REDNEG ALLSTARS SWING-BY EDITION". officially released. Click here for store page Please check out our

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Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-09-28.

GenresAction
Player tagsBullet Hell · Action · Top-Down Shooter · 2D Platformer · Shooter · Tutorial · Cute · 2D · Character Customization · Top-Down · Anime · Shoot 'Em Up (SteamSpy community voting)
FeaturesSingle-player · Steam Achievements · Partial Controller Support · Steam Cloud · Steam Leaderboards · Family Sharing
LanguagesEnglish, Japanese, Simplified Chinese, Traditional Chinese
Achievements40
Official sitehttps://ausorrllrrll.wixsite.com/outside
Minimum system requirements (PC)

Minimum: OS: Windows10 Processor: Intel(R) Core(TM) i5-4210M CPU Memory: 2 GB RAM Graphics: Intel(R) HD Graphics 4300 DirectX: Version 9.0 Storage: 1 GB available space Sound Card: Realtek(R)Audio