This has a lot of potential and I'm very excited to see what you do with it next!! I love the visual style and the shooting feels nice, and I love the slow moving enemy projectiles that you can dodge
It does need a lot more to it though, as I started to feel like I'm doing the same things over and over within 20 mins of playtime, I would definitely add more weapons, some more enemies (maybe an enemy that flies around you, to change things up a bit) more environment changes and possibly a shop of some kind to buy different upgrades or weapons
Overall, very good!! i'll be following this project and seeing where it goes!