Ok so here we go, Only Linus for now I'll ask Dylan for his input once he finished work:
I must strongly disagree I really like your implementation of the idea, I can't seem to find what engine you used but I really want to joink your screen-shake that gives really good feedback when you hit a wall.
the quick access menu with short-cuts on the right is something I'm beating myself up with for not having thought about, It enables to stay focused on the game and fully immersed : love it.
It took me about 4 levels to realise that your apples were not bombs I needed to avoid ^^, on that note it took some time for me to click that the optimal way to play is to fill out the screen, so maybe a shot tutorial or hints would go a long way.
Shaders, my man shaders are the way to go to make your game look/feel 20 times better than it actually is.
This is our first game Jam so maybe this is not true but I have the feeling that way more people are willing to try out browser games compared to actual downloading files.
Last thing, your game has a really big pixel size, that can seem "unpolished" to some people, quick fix I've seen around and that we kinda used is embedding your game into a viewport that pretends to be itself a screen, a phone, a CRT, a monitor.
Have that Sprite be in a hight pixel density and display your game on said screen -> game in a game it's usually a bit more appealing, but again I could be wrong