I love the concept a lot, I grew up playing all kinds of tower defense games. The music and general aesthetic of the game were really cool. I liked the storyline and I chuckled a bit at all the clever acronyms.
I had some notes on the execution. The enemies at the beginning could be slowed down just a little so you can get the hang of the way the spin works, I felt overwhelmed very quickly, but the upgrades helped out later. It would be great to have the ability to sell towers to get a little money back, I definitely regretted how I placed my towers, so it would be great to be able to revert. Lastly I thought the firing rate of the shooting towers was a bit slow, all it took was 2 enemies to overwhelm my turret. Maybe allow the player the shoot with the turrets themselves by pressing space?
Again, love the concept. The execution just needs a little bit more imo.