I REALLY like this art direction, it almost feels like an art project. It really stands out. The gameplay loop is quite simple and not necessarily something inherently new - which is in no way a critique. Simple games can exist and be very fun, despite not being entirely new.
However what this game does somewhat wrong occurs in areas where it is very painful to be wrong. Mainly the movement feels very sluggish clunky, charging a jump in a hectic environment can be lethal if an enemy approaches you. There also were numerous times where a slime was right at my character and I couldn't shoot him while jumping up, something that I intuitively thought would be possible hence the charge-jumping mechanic.
Another thing is that this game took very long to load into, what I couldn't really understand as it has some easy to digest assets and materials. Perhaps a cleanup is needed? I have quite a beefy computer so I am not really sure if it is a problem on my end. This certainly has some potential and I hope you re-iterate it beyond the game jam 3!