Hey, this is a pretty decent arcade shooter! It's not exactly bowling me over with innovation or breaking any new ground which I'd want to see from a game jam, but it nevertheless delivers a simple and fun explosive experience that's just plain fun. I had a couple of times where I wasn't even sure how I died because of all the visual chaos, but I felt like this game was very juicy and had a very good amount of enemy diversity that keeps the gameplay evolving and addictive, so all in all this was very nice.
Speaking of gameplay innovation and such, at the risk of sounding like an armchair developer, I feel like you might've missed a trick here. I noted that you made the design choice that enemies hitting your tail get damaged, and I thought that was very interesting and could've been utilized to create a more exciting gameplay loop where, instead of having generic guns that allow you to shoot from safety, instead you need to dangerously get close to enemies so as to trap them within your tail and make them crash into it. Obviously it doesn't work because you've built enemies specifically for the guns to handle like the laser walls, but I tried it in the early game and found it a very fun and more exciting way to play: perhaps it'd be worthy of experimenting with in the future, or a bonus challenge mode!
As a side note, I found the controls quite odd: you use the d-pad to navigate the menus, yet you can only use the analog stick to move within gameplay. You'd think they would be interchangable where you can use both of them for menu and gameplay movement, instead of them being locked to their own sections. It was a short time, but it was still a source of great confusion when starting out since I thought my controls weren't working!