It's good to see a fellow "horrible internet connection controls" game out there. I guess taking it literally is one way to go. Anyway, this is quite an interesting way to implement it. I felt a little panicked when suddenly I couldn't build/upgrade, and in that sense, the system works quite well indeed! Seeing toasters used as towers also gave me a giggle, surely that's funny as heck.
As for the tower defence side of the game, it's a little bit lacking, and I really hope it will be a bit more polished. But I am guessing you are running out of time at that point. At least the td can be played in full, from start to finish, with upgrades and placements, enemy types and such. It's already serviceable, so I think complaining too much will be just rude.
Anyway, good job on making the game! Keep up the good work!