Huge chance part of this is just a skill issue on my part but I had a really rough time getting anywhere. The game is quite punishing. The presentation is really nice and I also love the music!
Suggestions would include checkpoints (unless I'm so bad I never reached one of them haha), more health, more forgiving hitboxes (the spikes in particular feel like they can pop you from simply scraping them from the side and it feels a little bad to die that way) and some kind of way to track your height progress. The vertical resolution makes me feel like it's one of those mobile games where I want to set a cool score by seeing how high you can go :)
Overall I like this idea and with some tweaks you've got a really fun game here! Keep it up. I read you're working on a full version and I'd love to see it!