Games like Sky Cannoneer
Games like Sky Cannoneer include Kingdom Rush - Tower Defense, Orcs Must Die!, GemCraft - Chasing Shadows, Infested Planet, and Bloons TD 6. We matched them by the tags players give Sky Cannoneer on Steam (Action, Strategy, Indie, Sci-fi, and Tower Defense): closest matches first, and among equally close ones the better-known games.

Kingdom Rush - Tower Defense
Shared: Strategy · Tower Defense · Action

Orcs Must Die!
Shared: Action · Strategy · Tower Defense

GemCraft - Chasing Shadows
Shared: Strategy · Indie · Action

Infested Planet
Shared: Strategy · Action · Tower Defense

Bloons TD 6
Shared: Strategy · Tower Defense · Singleplayer

Aliens: Dark Descent
Shared: Strategy · Action · Sci-fi

STAR WARS™ Empire at War - Gold Pack
Shared: Strategy · Sci-fi · Singleplayer

Sanctum 2
Shared: Strategy · Action · Tower Defense

Taur
Shared: Strategy · Action · Tower Defense

Totally Accurate Battle Simulator
Shared: Strategy · Indie · Singleplayer

Total War: WARHAMMER II
Shared: Strategy · Action · Fantasy

Warhammer 40,000: Dawn of War III
Shared: Strategy · Action · Sci-fi

Dungeon Defenders
Shared: Strategy · Tower Defense · Singleplayer

Plants vs. Zombies GOTY Edition
Shared: Strategy · Tower Defense · Singleplayer

Defense Grid: The Awakening
Shared: Strategy · Tower Defense · Sci-fi

Orcs Must Die! 2
Shared: Action · Strategy · Tower Defense

DG2: Defense Grid 2
Shared: Strategy · Action · Tower Defense

Orcs Must Die! 3
Shared: Strategy · Tower Defense · Action

Kingdom Rush 5: Alliance TD
Shared: Strategy · Tower Defense · Singleplayer

X-Morph: Defense
Shared: Strategy · Action · Tower Defense

Warhammer 40,000: Dawn of War - Anniversary Edition (Classic)
Shared: Strategy · Sci-fi · Action

Anomaly Warzone Earth
Shared: Strategy · Indie · Action

Rock of Ages
Shared: Strategy · Indie · Action

Kingdom Rush Frontiers - Tower Defense
Shared: Strategy · Tower Defense · Singleplayer