Games like Aegis Defenders
Games like Aegis Defenders include Broforce, Orcs Must Die! 2, UFO 50, Terraria, and Shovel Knight: Treasure Trove. We matched them by the tags players give Aegis Defenders on Steam (Pixel Graphics, Tower Defense, Action, Indie, and Strategy): closest matches first, and among equally close ones the better-known games.

Broforce
Shared: Pixel Graphics · Action · Indie

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

UFO 50
Shared: Pixel Graphics · Indie · Action

Terraria
Shared: Pixel Graphics · Adventure · 2D

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

The Escapists
Shared: Pixel Graphics · Strategy · Indie

Dungeon Munchies
Shared: Pixel Graphics · Action · Indie

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

The Escapists 2
Shared: Pixel Graphics · Strategy · Co-op

SANABI
Shared: Pixel Graphics · Action · Adventure

Dungeon of the ENDLESS™
Shared: Tower Defense · Pixel Graphics · Strategy

Hero Siege
Shared: Pixel Graphics · RPG · Indie

Duck Game
Shared: Pixel Graphics · Action · Indie

Streets of Rogue
Shared: Pixel Graphics · Action · RPG

Hyper Light Drifter
Shared: Pixel Graphics · Indie · Action

Celeste
Shared: Pixel Graphics · Indie · Platformer

Risk of Rain (2013)
Shared: Indie · Pixel Graphics · Action

Magicite
Shared: Indie · Pixel Graphics · RPG

Dust: An Elysian Tail
Shared: Action · Indie · Platformer

Awesomenauts
Shared: Action · Indie · Platformer

Hammerwatch
Shared: Indie · Pixel Graphics · Action

Katana ZERO
Shared: Pixel Graphics · Action · Indie

Bloons TD 6
Shared: Tower Defense · Strategy · Co-op

TowerFall Ascension
Shared: Indie · Action · Pixel Graphics