Games like Steampunk Tower 2
Games like Steampunk Tower 2 include Kingdom Rush - Tower Defense, Until We Die, Plants vs. Zombies GOTY Edition, Kingdom Rush 5: Alliance TD, and GemCraft - Chasing Shadows. We matched them by the tags players give Steampunk Tower 2 on Steam (Tower Defense, Action, Strategy, Indie, and 2D): closest matches first, and among equally close ones the better-known games.

Kingdom Rush - Tower Defense
Shared: Tower Defense · Strategy · 2D

Until We Die
Shared: Strategy · Tower Defense · Action

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

Kingdom Rush 5: Alliance TD
Shared: Tower Defense · Strategy · 2D

GemCraft - Chasing Shadows
Shared: Tower Defense · Strategy · Action

They Are Billions
Shared: Strategy · Tower Defense · Base Building

Bloons TD 6
Shared: Tower Defense · Strategy · Singleplayer

Kingdom Rush 6: Genesis TD
Shared: Tower Defense · Strategy · Action

RimWorld
Shared: Strategy · Base Building · Singleplayer

Taur
Shared: Tower Defense · Action · Strategy

Oxygen Not Included
Shared: Base Building · Singleplayer · 2D

SteamWorld Heist
Shared: Steampunk · Strategy · Action

Kingdom Rush Frontiers - Tower Defense
Shared: Tower Defense · Strategy · 2D

Game Dev Tycoon
Shared: Strategy · Indie · Management

Kingdom Two Crowns
Shared: Tower Defense · Strategy · Singleplayer

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

Bloons TD 5
Shared: Tower Defense · Strategy · Action

Kingdom Rush Origins - Tower Defense
Shared: Tower Defense · Strategy · 2D

Infested Planet
Shared: Tower Defense · Strategy · Action

Rock 'N' Roll Defense
Shared: Tower Defense · Strategy · Action

Kingdom Rush Vengeance - Tower Defense
Shared: Tower Defense · Strategy · 2D

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

Grim Nights
Shared: Tower Defense · Strategy · 2D

Thronefall
Shared: Tower Defense · Strategy · Action