good start
You got a good idea and you should expand on it. Think of some other way to utilize the shockwaves rather than turning over turtles. Sorry that I can't tell you what that other way is, you are going to have to come up with that yourself :).
I found a few bugs, all of them had to do with jumping. I'm not sure how this happened, but at one point I became unable to jump. And while I was at this state, pressing down would create the shockwave. It was like I was on the 'jump state' when I wasn't jumping. The problem fixed itself, I believe when I hit the wall it got fixed it.
Other jump bug was when I was on top of a turtle, I couldn't jump. This time it didn't make shockwaves when pressing down, I just couldnt jump. Getting off the turtle fixed the problem.
Also not sure if this was intentional, but I couldn't do the shockwave if I were touching the wall when jumping.