Arrow keys to move, z to attack. Try not to have a bad tom. Attempting to attack can heal you. Move through blue bones, don't move through orange ones. White attacks just hurt. Avoid them.
TheKnewGreg Youtube for Waters of Megalovania https://www.youtube.com/watch?v=IQBqSt15Vi0 Please follow @_FORMULA_ for more (original) Undertale stuff!!! I made it slightly easier; no gaster blasters, attacking heals you a bit more.