Heya, lady. Long time no see.
So, what I liked - the building space was good, the upgrade system was relatively balanced.

What I didn't like:

1. Lingering projectile models bug - please force the game to delete models every second, while ignoring models attached to active projectiles and entities

2. Upgrading for your chips is unavaliable after certain levels - yeah, a bit underwhelming. At least remove the price for teh next upgrade when ya reach max level.

3. Overall FPS drop - I suggest completely removing physcis simulation from all the models, change Orbital strike to just a quick effect that spawns on the invisible damaging circle, and hasted the corpse despawn time when there are more than 50 alive enemies on the screen.

4. Mod Screen needs to be accessible at all times. After reaching final "level" of the character it's no longer avaliable, and thus you can no longer optimize your build. Which is sad. Add a button for it please, will ya?

Overall - please save this game as well as all the improvements of it as a mini-game for your main project.