Games like The Tawashi
Games like The Tawashi include Vampire Survivors, LUFTRAUSERS, Touhou Blooming Chaos 2, ZeroRanger, and BLUE REVOLVER. We matched them by the tags players give The Tawashi on Steam (Indie, Action, Shoot 'Em Up, Bullet Hell, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Indie · Pixel Graphics

LUFTRAUSERS
Shared: Indie · Action · Bullet Hell

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

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

BLUE REVOLVER
Shared: Indie · Shoot 'Em Up · Action

Rabi-Ribi
Shared: Bullet Hell · Anime · Indie

Dungeon Munchies
Shared: Indie · Action · Pixel Graphics

BALL x PIT
Shared: Action · Bullet Hell · Shoot 'Em Up

UBERMOSH:WRAITH
Shared: Indie · Action · Pixel Graphics

Enter the Gungeon
Shared: Bullet Hell · Indie · Pixel Graphics

Star of Providence
Shared: Bullet Hell · Indie · Shoot 'Em Up

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

DRAINUS
Shared: Action · Indie · Shoot 'Em Up

I Am Legion: Stand Survivors
Shared: Bullet Hell · Indie · Shoot 'Em Up

Skul: The Hero Slayer
Shared: Indie · Action · Pixel Graphics

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

Megabonk
Shared: Indie · Bullet Hell · Action

Nuclear Throne
Shared: Indie · Pixel Graphics · Action

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

Mirage Feathers
Shared: Bullet Hell · Anime · Shoot 'Em Up

20 Minutes Till Dawn
Shared: Bullet Hell · Shoot 'Em Up · Pixel Graphics

Jet Lancer
Shared: Indie · Action · Shoot 'Em Up

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

The Void Rains Upon Her Heart
Shared: Indie · Bullet Hell · Shoot 'Em Up