I love this! The art-style, music and sound effects are fantastic and you did a really great job on the fake-3D scrolling effect. Rad Racer on the NES was one of my favourite games and this feels just like it.
The sprites are perfect and this really feels like I could have been on the NES. I found it very hard, as others have said, but honestly the difficulty doesn't feel out of place as that's exactly how NES games used to be! I'll be coming back to this one to try and beat it!