Wow.....
Totally not chalenging, any level can be beaten by maximizing any kind of tower (except ice), unbaanced, and idiotically easy. Survival is pointless, since at some poit ur tower is maximized, than you can do nothing but watch it being destroyed.
The fact that each tower build gets expansiver, and each upgrade works for all towers of same kind, makes much better having a single type of tower.
Not funny at all.
You can practically go afk and still win
Magic towers are hideously overpowered compared to the others, so there's no strategy involved (especially since you upgrade an entire set of towers at once, making it awfully inefficient to mix it up). Your tower attacks on its own, so there's virtually no player interaction - the only thing you get to do is click a few times to add levels to your tower and upgrade its damage.
I'm not even sure you can really call this a game. It was more like an interactive movie with no plot, lame action, and boring graphics.