Yes, Windowkill supports co-op.

Does Windowkill have PvP?

Steam does not list PvP for Windowkill.

How many people play Windowkill?

About 14 players were in-game when this page was built (2026-09-09).

Ready Up — what game do we play?Compare two Steam libraries →

Multiplayer games › Shooter › Classic & campaign shooter

Is Windowkill multiplayer or co-op?

Yes — co-op, plus local/split-screen. Windowkill is a classic & campaign shooter game released in 2024, 96% positive on Steam (3,057 reviews), with 14 playing right now. $4.99 on Steam.

Co-opLocal / split-screenSingle-player tooShooter · Classic & campaign shooter

Windowkill is a twin-stick shooter, but the game window itself is constantly closing in on you. Shoot the window edges to push it around your screen as you…

Steam tags: Action, Indie, Action Roguelike, Bullet Hell, Arcade, 2D, Twin Stick Shooter, Experimental

Do you and a friend both own Windowkill?

Ready Up compares two Steam libraries and shows every multiplayer game you both have — including whether Windowkill is one of them — then helps you pick tonight's game with a weighted roll or a bracket.

Compare our libraries Steam store page

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Tired of Windowkill? The Swap tab finds the closest unowned games of the same type that are newer or rated higher.

Quick answers

Is Windowkill co-op?: Yes, Windowkill supports co-op.
Does Windowkill have PvP?: Steam does not list PvP for Windowkill.
How many people play Windowkill?: About 14 players were in-game when this page was built (2026-09-09).

Ready Up is a free tool: enter two Steam usernames and it lists the multiplayer games you both own, runs a bracket to pick one, and suggests new co-op games that fit how you both play. Ratings, tags and player counts from Steam and SteamSpy; updated 2026-09-09. Powered by Steam — not affiliated with or endorsed by Valve Corporation.