Tried it on android and it worked pretty great to play there
Got 82 in score
Neat idea with levels that you pick up upgrades that kept between respawns.
I think it would have been neat to have a rewind animation or something. Felt that you reset level when you pressed so took a while till I realized that the powerups i picked up is still active.
Could with some more polish with things like movement and levels actually become a full game. Kinda reminded me of Neon White sometimes.
Cool idea. As others said pretty unbalanced, feels like shot count upgrades was pretty much always the best ones followed by upgrades to shots themself.
I also feel like the way it scaled was a bit too much on quantity of enemies and bullets. the game started to chug quite a bit later on for me around level 30.