Wow this turned out to be a lot of fun! I think that one thing that I would like to see added is some kind of textured background just because when I was moving around it felt the enemies were floating in random directions. Also I was a little worried when I saw the main screen UI - but when the gameplay started those concerns quickly evaporated. I love the way the game looks, sounds and feels. I love the screen shake, the sounds of the explosions, and the post processing you've used. it sounds like I'm in an arcade again and I just want to pop in some more coins so I can keep playing. I know the things you can do in a game jam are limited but this has the perfect kind of format for a roguelite with powerups, waves, more enemies etc. It's a great game with a lot of potential and when I see these I always like to advise creators of platforms like crazygames where you can submitted polished web games for people to play and earn some revenue potentially as well. Good job.