Cute game, love the use of 2d sprites in a 3d environment.
Some gripes tho:
1. Camera rotates around the player weird so its hard to keep track of the rotation of my aim
2. The shooting itself is solid, but aiming is hard, its an interesting design choice to have the cursor rotate around the player instead of just rotating the camera and player to face the crosshair directly, but in a game like this, it's best to have it play more similar to a 3rd person shooter rather than like a tank game
3. UI could use some work, but thats just a small nitpick
I can see alot of potential in this game and looking forward to see what you do with this game.