I really enjoyed your game! This one is definitely up there as far as keeping to the theme. Really a unique take on a tower defense game. The graphics are the cherry on top, I've got a weak spot for sci-fi and your game really hits all the right spots. I would love to see you take the concept even farther.
For suggestions, I also noticed some of the same issues with the UI. My native resolution is 1920x1080 so not sure if the game was running off of that but if so, the 10 for energy was split the same as WigHz with the 1 on the first line and 0 on the next. I also had a hard time seeing the energy levels on turrets when they were at the edge of the screen. A way around this could be to have the energy/health of the structure pop up at the mouse cursor when you mouse over the buildings.
Either way, really enjoyed this!