Games like Molemen Must Die!
Games like Molemen Must Die! include Vampire Survivors, Skul: The Hero Slayer, Rogue Legacy, Risk of Rain (2013), and Broforce. We matched them by the tags players give Molemen Must Die! on Steam (Action, Indie, Action Roguelike, Female Protagonist, and Platformer): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Indie · Roguelite

Skul: The Hero Slayer
Shared: Action · Indie · Action Roguelike

Rogue Legacy
Shared: Indie · Action · Platformer

Risk of Rain (2013)
Shared: Action Roguelike · Indie · Action

Broforce
Shared: Action · Indie · Pixel Graphics

Dungreed
Shared: Action Roguelike · Action · Indie

Downwell
Shared: Action Roguelike · Indie · Action

Megabonk
Shared: Action Roguelike · Indie · Action

BlazBlue Entropy Effect
Shared: Action · Action Roguelike · Platformer

Rogue Legacy 2
Shared: Action · Indie · Arcade

Hades
Shared: Action Roguelike · Indie · Action

20XX
Shared: Action · Action Roguelike · Platformer

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Indie · Pixel Graphics

BALL x PIT
Shared: Action · Action Roguelike · Arcade

Celeste
Shared: Indie · Platformer · Pixel Graphics

Halls of Torment
Shared: Action Roguelike · Roguelite · Action

Nuclear Throne
Shared: Action Roguelike · Indie · Action

Hades II
Shared: Action · Action Roguelike · Roguelite

ScourgeBringer
Shared: Action · Indie · Action Roguelike

Spelunky
Shared: Action Roguelike · Indie · Platformer

Dead Cells
Shared: Action Roguelike · Pixel Graphics · Roguelite

Super House of Dead Ninjas
Shared: Action · Action Roguelike · Indie

Bleed
Shared: Action · Indie · Female Protagonist

Katana ZERO
Shared: Action · Pixel Graphics · Platformer