I added a comment that explains the full controls. I imagine you two won't be the only two who are confused. I really appreciate all of the feedback. R actually just restarts the level. The button you're looking for is L. The idea was if you put your right ring/pinky down to hold shift and then aim with WASD you can fire with your index by pressing L and jump with your thumb. I wish the keyboard controls were better. I'll see if I can figure out a nicer layout and update post-jam.