That's looking really cool for a game made in 10 hours.
I liked all of sprites, especially the virus one.The VFX are great too, adding eerie atmosphere to the game.
There's some things I would like to point out:
There was alot of enemies spawning, but they was dealing small damage, so I think it would be better if they had longer spawn cooldown and bigger damage dealt to player, or just player had less hp.Also, boss had few hp, so you can either make him tanky(lot of hp), or add some hard attacks in the future.
If not counting things that I typed above, game is really great, I hope to see more updates after the jam ends
(Also, if you could do one thing to make the syringe rotate around the player rather than a certain point(It's okay if you don't like that idea))