For games like this I'll usually add the controls on the pause screen.
Adding tutorials in games is more time consuming that it looks. You need to make a system that pauses at triggers (i.e. player hits one of the movement keys), then displays next tutorial text, then next trigger (i.e. player uses weapon key). For jams most people find this to be a waste of time vs improving other parts of the game.
Some people add in when the game starts a dialog box that says the controls, i.e. WASD to move, A to shoot, B to jump. I sort of did this with my game, but was more to just list out the win conditions of the game quickly.