The art style and all the different weapons add a lot to this game. It's very visually clear, especially with the player being this noticeable blue amongst the green and brown background.
I encountered a few issues that I think could help with the game becoming a bit more better. It felt at one point I had an audio bug where the BGM began playing twice which started to make the game music sound overwhelming, but that could just be the song and I could be wrong.
It would be amazing to have more feedback when either the player or enemy gets hit. A little bit of knockback and sound for both, and perhaps greying out the player while they're invulnerable for indication purposes.
The last issue is at times it felt like the player could quickly get swarmed by 3+ enemies at out of nowhere, and with all the ledges and short platform space within certain levels, its hard to fight these enemies without jumping into that large mass, so I found myself jumping past them.
I really enjoyed how you presented the tutorial as well, that being through the lightbulbs. Returning players can skip past but new players will be curious and check them out, or find them out by accident. This game was pleasantly enjoyable.