3d turf makes it very hard to see your placing properly. the slot thing is really craps becos it is pure luck. u should be allow to press 3 times for each 1. after digging, items should be auto-pick. some objects don't look like much but enuf to stop u from placing. some objects block the view to the square behind which waste alot of time trying to figure if u r placing in the rite place. nice game, but really too many defense game around.
build the cheap building, then u can build turrets over the enemy base spawn area. then u just let turrets do the killing. units move way 2 slow. they also get bloacked by obstacles. scrolling is kind of slow n buggy.