very cool, I love the pixelated retro look!
I feel like the bones are there but it could really needs a few quality of life additions that probably aren't too hard to add like mouse sensitivity option, a way to actually minimize or leave fullscreen (This one I know is very easy, I had to look up and add it to my game) and all that good stuff.
Regardless, very fun little game and I would love playing it again in the future with a few more enemies and upgrades :)