Hey, i played your game and i really wanted to give you some feedback that is actually going to help you...
Everything in the game can be improved but i wouldnt suggest you do that, you are clearly in a stage that you are learning and its a big milestone to reach at this point where you made a prototype and released it on a platform. I would suggest you to keep adding more things like pickups, maybe some movement mechanics, power ups, attack combos and keep practising on making mechanics and games, when you feel more confident you can join gamejams, its really easy to meet people on game jam discord servers and collab to make a game so you dont have to focus on everything.
I hope you keep up the work, i will follow you to get updates on everything you do!