Looks amazing! I think theres lots of room for you to expand from here, and you really should! It would be great if when you are in the defense stage that you as the player can do more than just build, maybe use your laser to fight or use the attractor to bring enemies closer to the turrets. Also, it would be great if you get points a bit more easily, as it felt like it took too long to get enough for upgrades. Really solid first game!