Windowkill

Windowkill is a twin-stick shooter whose central conceit is that the game window itself is part of the play space. The window is constantly trying to close in on you, and you can shoot the edges of the window to push it around — across your desktop, into and out of other windows, occasionally splitting into multiple windows as enemies and bosses spawn into their own separate frames that you have to track and engage independently.

The rest of the game is a relatively familiar arcade roguelike: twin-stick shooter controls, permadeath, shop screens between runs, upgrades and perks that broaden the build space, hordes of enemies and bosses with their own patterns, and several playable characters that change the way you approach combat. Local co-op is supported, and the unlock and stats systems give you something to chase across multiple runs even after you've seen most of the bosses.

What makes the game memorable isn't the shooter beneath but the way the desktop layer participates in it. Enemy projectiles can cross between windows; bosses sometimes hide in their own corners of the screen; the play space genuinely rearranges itself in response to where you push it. It's the kind of small, experimental design choice that wouldn't sustain a sixty-hour game but works perfectly at the focused scope torcado and Keestak (music) actually shipped. Mouse and keyboard are preferred; gamepad is supported.