Wish there was an infinite mode or description on the menu of what each tower does/can do. In my first couple hours I realized that some towers were useless as they didn't target certain cubes. I don't think the turret should be the cheapest tower, as it can shoot everything. Maybe it's upgrade can get ridiculously expensive, not sure. I didn't feel a difference with easy vs. insane, it just felt the same speed, same health; maybe I'm missing something though. I also think the last stage should say "coming soon," instead of "locked." It gives the impression that it can be unlocked, which I don't think it can. I don't know why I keep replaying this game. You should be allowed to speed up a game with friends too. Maybe a vote to speed up system? I tried playing with a friend but it's kinda unbearable to play on normal speed.