I love when entries nail the retro aesthetic, and I think this one did it well. I will say the music got a little grating and I had to turn down my volume a little bit, but overall I really liked the presentation. The palette you used was interesting, almost like an improved Gameboy palette.
Just some suggestions: I forgot to read the description and accidentally happened upon the dash button early on, but didn't realize that there are dedicated buttons for dashing left and right, so I thought there was a bug at first. I feel it would be more intuitive to use a single dash button, personally.
Past that, I think it's a good prototype! I assume then you'll be continuing work on it, and I'd be interested to see where it goes.