Use the arrow keys to guide the whale. Left-right and up-down work as expected. Press A and Z to swim towards the front or the back. Press K to shift between keyboard and mouse control mode. Press r to turn off the twisting behavior for one and E for the other (it's fun but a little glitchy).
if you press space you can start the food game and press T to stop and yes this is two-player and press g for one but this can't be undone sadly and I don't know how to fix it