Wow, that's a lot! I appreciate your feedback!! I have actually already fixed some of the things you've mentioned e.g. (bullet speed, reset key).
I did not notice the parallax, though. Thank you for mentioning that, and I also just fixed the screen tearing that you mentioned. I didn't know it was so easy to fix lol. I also fixed the canvas problem so the UI elements scale properly with the screen, so thank you for bringing that to my attention as well. Honestly, my friend and I kind of rushed this game since school inconveniently hit us like a freight train when this game jam started, so I apologize if it wasn't the most enjoyable experience.
I will be adding more SFX (like the landing you mentioned), and I'll see what I can do to make the platforms more distinguishable from on/off states. Again, thank you very much for your feedback!