Birdsong and The Sun And Moon creator Daniel Linssen’s latest Ludum Dare entry continues his streak of subversive experiments with Window frame, a platformer about vampire hunting that has a thing for windows. It takes place in a small window on your desktop, which moves around with you, revealing a blinkered view of a portion of the level. You’re armed with six stakes that you can fire at enemies, into the ground or into the edges of the window. Right-click on one embedded into the latter and you can drag the edge of the window towards you to create safe passage over spikes, obscure a cannon’s line of sight, or create a wall-jumping opportunity. Six vampires serve as bosses, your total count of stakes reducing by one after each encounter. It’s confoundingly brilliant.