Games like Slime's Revenge
Games like Slime's Revenge include SANABI, Pizza Tower, Blasphemous 2, Broforce, and Shovel Knight: Treasure Trove. We matched them by the tags players give Slime's Revenge on Steam (2D Platformer, Pixel Graphics, Arcade, Action, and 1980s): closest matches first, and among equally close ones the better-known games.

SANABI
Shared: Pixel Graphics · 2D Platformer · Action

Pizza Tower
Shared: 2D Platformer · Pixel Graphics · Action

Blasphemous 2
Shared: Pixel Graphics · 2D Platformer · Fantasy

Broforce
Shared: Pixel Graphics · Action · Side Scroller

Shovel Knight: Treasure Trove
Shared: Pixel Graphics · Action · Platformer

UFO 50
Shared: Pixel Graphics · Action · Arcade

Momodora: Reverie Under The Moonlight
Shared: 2D Platformer · Pixel Graphics · Side Scroller

Rogue Legacy 2
Shared: Arcade · Action · Platformer

Katana ZERO
Shared: Pixel Graphics · Action · 2D Platformer

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

Celeste
Shared: Pixel Graphics · 2D Platformer · Platformer

Sonic Origins
Shared: 2D Platformer · Action · Pixel Graphics

Dungeon Munchies
Shared: Pixel Graphics · Action · Adventure

Kung Fury: Street Rage - Ultimate Edition
Shared: Arcade · Action · Pixel Graphics

Downwell
Shared: Pixel Graphics · 2D Platformer · Arcade

Webbed
Shared: 2D Platformer · Pixel Graphics · Action

Blasphemous
Shared: Pixel Graphics · Souls-like · Action

Alex Jones: NWO Wars
Shared: Arcade · 2D Platformer · Action

Rogue Legacy
Shared: Action · Platformer · Pixel Graphics

Exit the Gungeon
Shared: Arcade · Action · Pixel Graphics

Bloodstained: Curse of the Moon
Shared: Pixel Graphics · Action · Side Scroller

Deaths Gambit: Afterlife
Shared: Pixel Graphics · Action · Souls-like

Anomaly Agent
Shared: 2D Platformer · Side Scroller · Platformer

Eastern Exorcist
Shared: Action · Side Scroller · Adventure