Hello fellow Gamemakers, this is BloodSpawn by Moltak.
A/D or Arrow keys to move Space is jump. Shift is Sprint.
Sprinting makes you invulnarable for a short time but take a BloodCharge away from you. You can jump off walls to sneak behind enemies.
Also there's no way to win so just keep racking up score until you die. (or the game lags out since I do no checks)
There doesn't seem to be anything here.