Its a funny game, a good first one, some pointers that might help next time:
there is no feedback on damage received, and no instructions on how collision works
sfx are a important part of the experience and should not be totally overlooked
the bullets can damage the one who used them, i dunno if was intentional but its an interesting design choice,
it's a nice thing to have unlockables, but there is no feedback to say you have unlocked anything
if you are starting in the area, sakurai the creator games like smashbros and other famous games has a youtube channel with a lot of tips on game creation https://www.youtube.com/@sora_sakurai_en
time is limited so i cant say much more now, if you need anything just send a message
good luck!