Great idea, great polish, and great graphics! I'd love to see a more developed version of this.
My only real complaint was that the aim seemed to be off - it was shooting about 30° to the left of the curser, which I'm pretty sure is a bug.
Yeah, I noticed on smaller than 1920x1080 it was changing the alignment of the cursor in game. I wasn't able to figure out how exactly to fix that in time.