Haha! Great work!
I am a huge fan of these games! A simple concept like a Tesla coil turning into a huge death tower....Loved it.
The upgrades were balanced JUST right so that the last wave was still hard, yet you felt almighty.
The artwork was great, fell into place amazingly. The "minibosses" as it seemed were advanced and came in at the right moments.
Really loved that you had to upgrade at the right time with the right choices.
All in all, you've done great work here.
10/10
5/5
Keep at it. ;3