Games like Rival Megagun
Games like Rival Megagun include Counter-Strike 2, Tom Clancy's Rainbow Six Siege, Duck Game, Enter the Gungeon, and SpeedRunners. We matched them by the tags players give Rival Megagun on Steam (Bullet Hell, Competitive, Shoot 'Em Up, Multiplayer, and 2D): closest matches first, and among equally close ones the better-known games.
Counter-Strike 2
Shared: Competitive · Multiplayer · PvP
Tom Clancy's Rainbow Six Siege
Shared: PvP · Multiplayer · Competitive
Duck Game
Shared: Multiplayer · 2D · Indie
Enter the Gungeon
Shared: Bullet Hell · Indie · Multiplayer
SpeedRunners
Shared: Multiplayer · Competitive · Indie
Bit Blaster XL
Shared: Bullet Hell · Shoot 'Em Up · 2D
Just Shapes & Beats
Shared: Bullet Hell · Multiplayer · 2D
Move or Die
Shared: Multiplayer · 2D · Indie
LUFTRAUSERS
Shared: Bullet Hell · Indie · Shoot 'Em Up
Cuphead
Shared: Difficult · 2D · Multiplayer
Revolution Ace
Shared: Bullet Hell · Shoot 'Em Up · Indie
Rocket League®
Shared: Competitive · Multiplayer · PvP
Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Bullet Hell · Shoot 'Em Up · Difficult
Touhou Tenkuushou ~ Hidden Star in Four Seasons.
Shared: Bullet Hell · Shoot 'Em Up · Difficult
Vampire Survivors
Shared: Bullet Hell · 2D · Indie
PUBG: BATTLEGROUNDS
Shared: PvP · Multiplayer · Shooter
Dota 2
Shared: Multiplayer · Competitive · PvP
Rivals of Aether
Shared: Multiplayer · Competitive · Indie
ZeroRanger
Shared: Bullet Hell · Shoot 'Em Up · Indie
Broforce
Shared: 2D · Multiplayer · Indie
DJMAX RESPECT V
Shared: Multiplayer · Competitive · Cute
DRAGON BALL FighterZ
Shared: Multiplayer · Competitive · PvP
Stick Fight: The Game
Shared: Multiplayer · PvP · 2D