A super fun twist on a tower defence genre, great idea! Some levels were quite hard but could finish the game (cycle to the first level?) after a few tries. There was no explanation of what each tower does, but the mechanics were simple enough so a try and see approach worked fine. There are a couple of things that I think would improve the game even more.
First, I think there is a bit of imbalance between the structures. For example, the barracks that spawn robots seemed a bit underpowered compared to other towers. In most situations, I was better off powering a turret instead. I think a third type of enemy wave with a low number of super-fast enemies could give the barracks more meaning.
Some more easily readable UI (e.g. health bar/heart icons ingame for the base and some icons for available cables) would also be nice since there was no time to read numbers on the UI in the corner during the game.
However, these are very small details, so take them more as suggestions if you want to move forward with the project rather than a criticism. I had great fun with the game, good job on making this in such a short time!