challenge accepted! :D (i lost lifes though xD)
13:19 now, with death strats =D (mid-end of wave 29 i sold all towers, thats why it looks so strange :D)
i think though that killing the boss is faster. but in this game i wasnt sure with my setup. also, if it didnt work, my water towers would slow/freeze the guy and make time longer. so selling everything was the safer way
