Guys, make sure you get a e-rocket thing and parachute ASAP. Just boost up to the highest height you can reach and simply glide sideways. I was in the air for 2 minutes on Day 3. Dont worry about rocket fuel and band launcher and shiet, get that stuff AFTER you get the e-rockets.
No selling = Makes you think about the potential enemies in the level and where you should place your mages/knights = Much more strategic thinking than your average tower defense.
Im surprised at teh amount of level 12 skills there are.. Considering that I beat the game at level 5 (Ardum), and monsters dont seem to respawn so.... How the hell do you gain all that extra xp? :T