Lovely game! I had to get used to the controls at first, but I really enjoyed it. Using the coin sprite as a wheel is creative.
What's even more creative is the skeleton spawn animation. That's great stuff.
The fact that the wheel always rolls clockwise, even if you're moving left, feels a little strange. But honestly, given the whole momentum thing, I'm not sure if it'd look better if it didn't.
And regardless, that's nitpicking in what's definitely a big game for such a small development timeframe. It's impressive! I'd honestly love to see a full game like this!