You should definitely give a short info in your game that it is solely mouse controlled and that shooting is automatic, it would highly increase the pick-up-and-playability! (Yeah, it's in the jam, but I missed that since I was just picking up arcade shooter games on itch, I didn't pay attention to that).
I like the game and played it for a few minutes, 1500 points was my maximum. What I don't like it that it feels a bit too random for me. I feel like I got those points out of pure luck, not so much by skill.
Also, the shooting mechanic kinda doesn't really "do its job" well enough from my perspective, unless I missed the point of it. Maybe, when the ship shoots, it should at least have some sort of aim assist so you only have to turn the ship into the right direction at the right time (which is quite difficult already), but then can be sure you will wipe out some enemies.
From my point of view, with a few tweaks, this could become an awesome game! Hope this feedback helps somewhat! :-)