A nice little game! I really like the simple aesthetics, sounds, music, and the simple controls. I would have liked an upgrade to increase the hit area of my shots to hit the smaller targets more easily.
The screen shake felt a small bit off as it felt like it were in the way of aiming, especially on the smaller targets when everything starts to swarm. It also felt like I wasn't rewarded enough for shooting down bigger enemies when all enemies were only worth 1 point each. if it had been 1, 2, and 5 it would have felt better. :)
Aside from that I feel like it's a solid prototype with great potential!