W,A,S and D to move, Space to shoot, 1,2,3 and 4 to select inventory spaces. Touch crates to pick up the weapon inside; you may have to sit inside the crate for a second or two depending on how the crate is moving.
Feel free to take this and turn it into something! (etc: a fully-fledged battle royale game with the skydiving and landing, a multiplayer battle, or anything else.) Every time you spawn you're a different colour :]
