The game is too hard..
You can't count on 4 jumps to beat the later parts. All you need is luck. If you are not lucky with the buildings you will fail.
You could've added some upgrades or powerups for the later parts to make it possible at least.
The slide was useless. I don't know what was the point of it since you end up running at the same speed as the monster behind you. Also, you can't jump while sliding, so you end up slowing down instead of moving forward. At some points, the slide glitched when I pressed the jump button, and I started digging through the buildings (going downward) and ofcourse I lost because of it.
I think the last 5 medals are impossible at the moment, unless you hack the game (according to the top scores.) Also, I should've gotten 1 of the secret medals, but for some reason I didn't.
Overall, good game but too hard. If you can make it a little easier, it would be great I think :o