Typing this as I play:
The rockets shouldn't slow you down.
The items shouldn't only be slightly above the ground because that makes going higher pointless.
Needs another way to make money or a money upgrade. (probably the first thing that should be improved)
The bounce should reduce the speed you lose if you hit the ground or make it a seperate upgrade.Don't know if anyone else had this problem but I found myself bouncing high and going nowhere at all sometimes which just wasted time going to the shop.
All in all a good game but it need some tweaks.
I gave this game a 5/5 just because it made me laugh, but I had to quit once I got to the cars part. It doesn't feel like I'm hitting the cars but I'm sure it's just me messing up.