Also, I'm guessing English is not your native language, as is fairly common among developers here. When referring to combos, the total number of hits, not just subsequent hits without stopping, form the number of the combo. For example, if I jump on one guy's head, then one sheep, you call this 1 combo, when it's properly "a 2 combo" for the two total hits. Also, in several missions, you have described things like "get 5 combos" when the actual mission, properly stated in English speaking gamer dialect is to perform "a 6 combo". Hope this helps. Feel free to PM me if you'd like some help working out the descriptions to better suit the target market!
Way too slow to progress later on. If I wanted to pay out the ass to progress slightly in a craptastic build and sell stuff game, I'd play farmville. No thanks.
So it's Kingdom Rush, but I have to spend my already limited resources and space to put down an oversize building that I need before I can put down towers, and the cost of buildings increases exponentially... What's not to love?