Felt enjoyable. My two cents:
The concept is nice. Perhaps a few more elements to explain it? I didn't feel very mad-scientisty while playing, if that makes sense, it just felt like regular tower-defense stuff. Maybe make the little hero-bots look more heroe-y (with capes, or something) or make the player's cursor more villanous.
The gameplay is decent. Perhaps a bit more individuality to the functionality of the rooms? The rooms looks very different, but operate quite similar. There seem to be subtle differences in the kill-zones of each room, but it isn't made very apparent to the player. I couldn't tell from the beginning that the fans were not that good at killing enemies that turned just around the corner. I'm not sure if that is by design, though. Ultimately, up to you, depends on how you'd execute it.
The intuitiveness of the game felt ok, too. It mostly just requires a pump of game juice to improve in this area.
Best of luck, fellow game devs. I envy your success :) perhaps someday I will catch up