Games like Portal Guardians
Games like Portal Guardians include Magicka, Orcs Must Die! 2, Bloons TD 6, Orcs Must Die! 3, and Magicka 2. We matched them by the tags players give Portal Guardians on Steam (Tower Defense, Action, Idler, Strategy, and Magic): closest matches first, and among equally close ones the better-known games.
Magicka
Shared: Co-op · Action · Comedy
Orcs Must Die! 2
Shared: Tower Defense · Co-op · Action
Bloons TD 6
Shared: Tower Defense · Strategy · Co-op
Orcs Must Die! 3
Shared: Tower Defense · Co-op · Strategy
Magicka 2
Shared: Co-op · Magic · Action
Orcs Must Die!
Shared: Tower Defense · Action · Strategy
Monster Hunter: World
Shared: Co-op · Action · Multiplayer
Bloons TD 5
Shared: Tower Defense · Co-op · Strategy
Borderlands 2
Shared: Action · Co-op · Multiplayer
PEAK
Shared: Co-op · Multiplayer · Comedy
Dungeon Defenders
Shared: Tower Defense · Strategy · Multiplayer
Orcs Must Die! Deathtrap
Shared: Tower Defense · Co-op · Action
Human Fall Flat
Shared: Co-op · Funny · Action
Kingdom Rush - Tower Defense
Shared: Tower Defense · Strategy · Action
Sanctum 2
Shared: Tower Defense · Co-op · Action
Warhammer 40,000: Space Marine 2
Shared: Co-op · Action · Multiplayer
Gang Beasts
Shared: Co-op · Action · Funny
Who's Your Daddy?!
Shared: Funny · Co-op · Strategy
Deathtrap
Shared: Tower Defense · Action · Co-op
Dungeon Defenders: Awakened
Shared: Co-op · Tower Defense · Strategy
Rock of Ages 2: Bigger & Boulder™
Shared: Action · Strategy · Tower Defense
Borderlands: The Pre-Sequel
Shared: Co-op · Action · Comedy
Monster Hunter Wilds
Shared: Action · Co-op · Multiplayer
RV There Yet?
Shared: Co-op · Funny · Multiplayer