cute music and art !
i don't usually play these type of games, i'm not versed in the genre so these are just my quick impressions:
- some feedback when you get hit would be nice, most of the time i didn't notice it happened until i saw my hp bar was lower, i don't really feel the impact of getting hit or hitting other things, which i think would bring up the game feel of this
- the upgrades were kind of useless to me since i could just move around fast enough to outrun everything, i didn't feel like i was progressing or getting stronger because of this
- there were so many enemies and they took a lot of hits that i didn't notice if/when something died (whith the lack of feedback from point one as well), which made it unclear if actually killing something gives me xp or not, so my tactic was just keep moving around, which i don't think was the intended experience
absolutely understandable to not make a perfect game for a short game jam, you all still did a lot and it turned out nice, just something to keep in mind for future projects :]
good luck !