Heyo! This was a pretty fun demo.
I got to about 14XX. Wasn't sure how to get out without F4, but it was pretty nice and intuitive even without doing the tutorial (so points for that!) and fun game
Intermissions were funny but also a little frustrating. I don't know if that was on purpose or not.
I'd be be curious to see how this looks as a fuller experience with more enemy patterning (I got to the point of three spawners at once) and maybe some obstacles, powerups or powerdowns for the cursor; there's some great potential for messing with geometry here.