Aww, that sucks. I can help with the concept though. I have been pretty lax in the community for the past few months and need something to keep me active. I can help you, give you pointers, help you come up with ideas, anything that will help the game along. I may also start working on my games and movies again soon. School just ended and I graduated but I am at the beach with my friends for the week. So after this trip I will probably start working on War Zone 2, Infiltration 2, and help people like you in my spare time.
Yeah, I am pretty experienced with alice. Building a tower defense game will be tough though. But i can definitely try and help you. Make a thread, post what you have (If anything) and we can work on it. (I wont do it for you, but I will gladly help you)