Hi!
First, well done on making a game.
Well done on making a working shooter game, and props to you for including a tutorial screen, which many games failed to do. (The tutorial screen won't go away for me, but it wasn't too bad.)
The main issue is performance - the game seems really laggy/buffery, and I have a very high end laptop with only a couple of Chrome tabs open, so my laptop's performance isn't the issue.
To add some polish, maybe add a soundtrack!
Well done on your game design efforts this year, and I hope to see you back for the next one.
- Ethan