The game does tell you but, A and S are to do a flip, D is a barrel roll, F is a Ninja kick, G is to do a helicopter, and I is to show or hide the instructions. Use the bounciness to change how high you bounce (some moves you need to be at higher height to do). Its fun if you set bounciness to 100 then 0 before he hits the ground it looks funny to watch him sink into the ground. v1.1 tweaked some stuff but not much.
I made this in about an hour and I designed everything. I might edit this game later and add a few stuff. I did take it down because I was updating it but my vision did not exactly work so I just left it (mostly) the same.