Very cool entry!
Gameplay wise I think the hitbox for the bike thingy is a bit too unforgiving right now. I think the controls feel good, if maybe a tad sensitive. I really like the boost idea which launches you ahead, I think it could be a great tool for speedrunning!
Themewise, I like how it ties into the main mechanic. I would have liked some more thematic implementation of the concept though, like maybe a fire animation when you launch or a sound of a fiery explosion!
The aesthetics are very simple, but work really well. It's very nostalgic and definitely brings me back to simpler times, lol.
Sound wise, I didn't feel the lack of music, so I think that was a good choice. The aesthetics definitely imply more of a quiet, very sparse soundscape, so I think having no music works a bit into that. I do feel it feels a bit empty sometimes though, having sounds for touching the ground at different speeds could be a good idea for future iterations.
Cool entry, keep up the good work!