Games like MolaMolaAdventure
Games like MolaMolaAdventure include Vampire Survivors, Broforce, Enter the Gungeon, LUFTRAUSERS, and Skul: The Hero Slayer. We matched them by the tags players give MolaMolaAdventure on Steam (Bullet Hell, Action, Shooter, 2D, and Cute): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · 2D · Pixel Graphics

Broforce
Shared: Action · 2D · Pixel Graphics

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

LUFTRAUSERS
Shared: Bullet Hell · Action · Indie

Skul: The Hero Slayer
Shared: Action · Indie · 2D

Undertale
Shared: Pixel Graphics · 2D · Bullet Hell

Exit the Gungeon
Shared: Action · Bullet Hell · Indie

DELTARUNE
Shared: Bullet Hell · Pixel Graphics · 2D

Nuclear Throne
Shared: Bullet Hell · Action · Pixel Graphics

My Friend Pedro
Shared: Action · Shooter · Indie

SANABI
Shared: Action · Pixel Graphics · 2D

Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Bullet Hell · Action · 2D

Duck Game
Shared: Action · 2D · Pixel Graphics

Angel at Dusk
Shared: Bullet Hell · Action · Shooter

DRAINUS
Shared: Action · Shooter · Bullet Hell

Bit Blaster XL
Shared: Bullet Hell · Shooter · 2D

Dungeon Munchies
Shared: Action · Indie · Pixel Graphics

Gensokyo Night Festival
Shared: Action · Indie · Pixel Graphics

Rabi-Ribi
Shared: Bullet Hell · Cute · Pixel Graphics

NOT A HERO
Shared: Action · Pixel Graphics · Shooter

Rocket Rats
Shared: Bullet Hell · Pixel Graphics · 2D

Gunpoint
Shared: 2D · Action · Indie

Planes, Bullets and Vodka
Shared: Action · Bullet Hell · Shooter

Touhou Kouryudou ~ Unconnected Marketeers.
Shared: Bullet Hell · Action · Shooter