Games like Kick the Boss's Ass
Games like Kick the Boss's Ass include Vampire Survivors, Mewgenics, Balatro, Plants vs. Zombies GOTY Edition, and Ballionaire. We matched them by the tags players give Kick the Boss's Ass on Steam (Casual, Strategy, Dark Humor, Bullet Hell, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Pixel Graphics · Roguelite

Mewgenics
Shared: Dark Humor · Roguelite · Turn-Based Strategy

Balatro
Shared: Strategy · Pixel Graphics · Casual

Plants vs. Zombies GOTY Edition
Shared: Strategy · Casual · Singleplayer

Ballionaire
Shared: Casual · Strategy · 2D

Rocket Rats
Shared: Casual · Bullet Hell · Pixel Graphics

RACCOIN: Coin Pusher Roguelike
Shared: Strategy · Casual · Turn-Based Strategy

Bloons TD 6
Shared: Strategy · Casual · Singleplayer

20 Minutes Till Dawn
Shared: Bullet Hell · Roguelite · Pixel Graphics

The WereCleaner
Shared: Casual · Dark Humor · Strategy

Into the Breach
Shared: Strategy · Pixel Graphics · Turn-Based Strategy

DAVE THE DIVER
Shared: Casual · Pixel Graphics · Singleplayer

Slots & Daggers
Shared: Casual · Strategy · Roguelite

The Last Spell
Shared: Strategy · Turn-Based Strategy · Singleplayer

Boneraiser Minions
Shared: Bullet Hell · Pixel Graphics · Roguelite

Death Must Die
Shared: Bullet Hell · Pixel Graphics · Roguelite

Cult of the Lamb
Shared: Dark Humor · Roguelite · Singleplayer

Asgard's Fall — Viking Survivors
Shared: Casual · Bullet Hell · Pixel Graphics

Cluckmech Oasis
Shared: Strategy · Pixel Graphics · Roguelite

Cookie Clicker
Shared: Casual · Pixel Graphics · Strategy

Noobs Want to Live
Shared: Bullet Hell · Pixel Graphics · Casual

Seraph's Last Stand
Shared: Casual · Bullet Hell · Pixel Graphics

DELTARUNE
Shared: Pixel Graphics · Bullet Hell · Singleplayer

Montaro
Shared: Casual · Pixel Graphics · Cute