Hi there! First Jammer here as well! I played a bit of this and it seems genuinely interesting. The idea that you have to heal your enemies, but they still try to hurt you is really unique!
My only issue is the tutorial. It's never clear what you're supposed to press in order to advance the dialog. I actually figured out the controls before I figured out how to advance the dialog. Also, the way the text wraps is kind of awkward and can be hard to read at a glance.
Otherwise, I think the concept is pulled off pretty well! The variety of enemies is nice, although once melee enemies come in it becomes a necessity to always run away. I think if you could slow them down and maybe vary their approach to you (say one is direct but another tries to flank you) that would be interesting.
Overall though, for it being your first completed game (and made in a week at that) I think you did very well!
I wish you the best! And if you want to check out my submission, here's the link!