Games like Overboard!
Games like Overboard! include War Thunder, GORN, Serious Sam Fusion 2017 (beta), Hotline Miami, and My Friend Pedro. We matched them by the tags players give Overboard! on Steam (Action, Indie, Gore, and Free to Play): closest matches first, and among equally close ones the better-known games.

War Thunder
Shared: Action · Free to Play · VR

GORN
Shared: Action · Gore · VR

Serious Sam Fusion 2017 (beta)
Shared: Action · Gore · Indie

Hotline Miami
Shared: Action · Indie · Gore

My Friend Pedro
Shared: Action · Indie · Gore

Blade and Sorcery
Shared: Gore · VR · Action

SMITE®
Shared: Action · Free to Play · Indie

Aimlabs
Shared: Free to Play · Action · Indie

The Walking Dead: Saints & Sinners
Shared: Action · VR · Gore

CARRION
Shared: Gore · Action · Indie

Pavlov
Shared: Action · VR · Gore

LOEK
Shared: Action · Indie · Free to Play

Century: Age of Ashes
Shared: Action · Free to Play · Indie

Warframe
Shared: Free to Play · Action · Free To Play

Hotline Miami 2: Wrong Number
Shared: Gore · Action · Indie

Serious Sam VR: The Last Hope
Shared: Action · Gore · Indie

Call of Duty®: Warzone™
Shared: Free to Play · Action · Gore

Chivalry: Medieval Warfare
Shared: Action · Gore · Indie

Vertigo Remastered
Shared: Action · Indie · Gore

Bright Memory: Infinite
Shared: Action · Indie · Gore

Apex Legends™
Shared: Free to Play · Action · Free To Play

Quake II RTX
Shared: Action · Free to Play · Gore

Arizona Sunshine® VR Legacy
Shared: Action · VR · Gore

Dead Effect 2 VR
Shared: Action · Indie · VR