Pretty simple, pretty fun, all good. I also really like the Background, I'm not sure why tho lol, it just feels good to look at it.
The music is a bit loud tho, and also too short, so it got annoying very easily lol.
I also wish to be either telegraphed where the enemies are going to spawn, or that they at least didn't shoot immediatelly after appearing, because the way it is now I take free damage way too often from enemies that spawn and shoot right above me without giving me any chance to react.
That's my score tho, couldn't make it up to 1000 sadly
edit: my comment got duplicated, sorry for the double ping :,)