Solid gameplay, this would work really good on mobile phones.
Adding small vfx and specially simple sound effects would go a long way in improving your game, these things are more effective that you might think
Fairly good execution of the game in general.
The controls are a bit wonky and intuitive at least at first but this also makes the controls inverting mushrooms much more threatening.
Also the level is always the same, this makes this kind of games rather repetitive and more of a memorization challenge than anything else.
But that kind of thing is to be expected, making a procedural level generator in a game jam is very hard so i am not going to complain much.
Nice and interesting platformer. I like the idea and the level design looks good and the polish is very good for a game made in 2 days.
The only complaint i have is that the physics are weird at times and the controls sometimes are a bit unresponsive, most notably the double jump that works just fine with spacebar but using w or up arrow sometimes doesn't actually register. this doesn't break the game or anything so i'm not mad about these issues.
Overall, pretty good.
https://itch.io/jam/gmtk-2019/rate/463162
Mine fits the description so
The idea is a bullet hell shoot em up where you only have to dodge one bullet