Loved the simplicity and the pixel graphics, it's great considering how much time you've had. There's one small issue that happened to me. Trying to play in Brave Browser, the game didn't run, so I tried Firefox, but it seems that (at least in mine PC), Spacebar is a shortcut to scroll down the page, so everytime I tried to hit the enemies, my browser would just scrolldown a lot and I couldn't see the game. This is weird because when playing other games I often use Spacebar and this doesn't happen.

Anyway, despite of that, I've love the graphic style, the background is gorgeous, this would make a fabulous concept for a mobile game, you should consider working on it some more and trying the Google Play Store and/or AppStore

Nice little game fr a 5 hour creations time.  Works fine on chrome but firefox likes to send you halfway down the page when you hit space silly thing.  Not sure if this site lets you make it so you can click a link and have the game the only thing on the screen.  But that isn't your fault that would be a browser issue.

It's a bit boring after a while maybe adding more enemies or power-ups and stuff would have been a lot better

It is a good idea to space out to hehe.  Good job putting something together in a short amount of time.  It's always good to practice and get something finished! If you have some spare time, please check out my entry game 'Europa'.  I really appreciate feedback in game jams. (helps me improve)