Great game, just some ideas though.
I find this game very good and very addictive, but I have an idea for the coins.
I think it'd be pretty cool if you made an item shop, where if you got enough coins from the game, you could purchase things like a parachute (To slow your player down for a short period of time) , then you could upgrade those items to make them do more, last longer, etc. Like I said though, great, addictive game.