Love the presentation, and I'm always a sucker for arcade games.
It's a fun game overall. But I have some gripes: firstly, your hat isn't part of your hit box so you always have to jump to reach coins. Also, while I love the feedback you get for rolling on the ground, where you kinda wobble, it takes a bit of control away, which would be fine, but a lot of platforms are too small for it. And yeah, a tutorial screen of sorts would be great.
But I had a lot of fun! Love the graphics and the music even more. Reminds of me of Sonic CD, and that's a compliment.