Games like A City Sleeps™
Games like A City Sleeps™ include Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil, Touhou Fuujinroku ~ Mountain of Faith., Beat Hazard, TouHou Makuka Sai ~ Fantastic Danmaku Festival Part II, and Just Shapes & Beats. We matched them by the tags players give A City Sleeps™ on Steam (Indie, Action, Bullet Hell, Shoot 'Em Up, and Rhythm): closest matches first, and among equally close ones the better-known games.

Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Bullet Hell · Shoot 'Em Up · Action

Touhou Fuujinroku ~ Mountain of Faith.
Shared: Indie · Action · Bullet Hell

Beat Hazard
Shared: Rhythm · Bullet Hell · Shoot 'Em Up

TouHou Makuka Sai ~ Fantastic Danmaku Festival Part II
Shared: Indie · Bullet Hell · Shoot 'Em Up

Just Shapes & Beats
Shared: Rhythm · Bullet Hell · Indie

ZeroRanger
Shared: Indie · Shoot 'Em Up · Bullet Hell

The Void Rains Upon Her Heart
Shared: Indie · Bullet Hell · Action

Touhou Kouryudou ~ Unconnected Marketeers.
Shared: Bullet Hell · Action · Shoot 'Em Up

Touhou Juuouen 〜 Unfinished Dream of All Living Ghost.
Shared: Action · Bullet Hell · Shoot 'Em Up

TouHou Makuka Sai ~ Fantastic Danmaku Festival
Shared: Indie · Bullet Hell · Action

Touhou Tenkuushou ~ Hidden Star in Four Seasons.
Shared: Bullet Hell · Indie · Shoot 'Em Up

Touhou Chireiden ~ Subterranean Animism.
Shared: Indie · Action · Bullet Hell

Touhou Kikeijuu ~ Wily Beast and Weakest Creature.
Shared: Indie · Bullet Hell · Shoot 'Em Up

LUFTRAUSERS
Shared: Indie · Bullet Hell · Action

DRAINUS
Shared: Action · Indie · Shoot 'Em Up

Maiden and Spell
Shared: Indie · Action · Bullet Hell

Touhou Blooming Chaos 2
Shared: Action · Indie · Bullet Hell

Bright Memory: Infinite
Shared: Action · Indie · Female Protagonist

Rift of the NecroDancer
Shared: Indie · Rhythm · Action

BLUE REVOLVER
Shared: Indie · Bullet Hell · Shoot 'Em Up

Touhou Kinjoukyou ~ Fossilized Wonders.
Shared: Bullet Hell · Action · Shoot 'Em Up

Symphony
Shared: Indie · Action · Shoot 'Em Up

弹幕音乐绘 ~风雷幻奏曲~ / Barrage Musical ~A Fantasy of Tempest~
Shared: Indie · Action · Bullet Hell

Bleed 2
Shared: Indie · Action · Bullet Hell