That game is too boring for me. I played only for ~15mins... can't make myself to continue. Every time I fight against even 5 monsters, I don't lose even 5% hp... Make it harder and upgrade it like other ppl here says...
So far, I end 4 level and when game should show me points and map I got to lvl4 again... with my turrets and no more waves. Can't play anymore.
However, game seems too easy - many machinegun turrets and no1 could come thru.
If u cant do all perfects w/out cheats, u just suck. And it doesn't matters if u have points or not, n00b... ^^
BTW. game rocks ;p however, i didn't done all perfects yet :(
And BTW... i understand, losing mission when chances r 75% or less... i understand, sometimes even with 90% I can fail... but what if on 5 missions at 98% or more I fail 3 times? It sucks, IMO.