Why is Level 15 like godly difficult? And then why is level 16 like super easy in comparison? It just doesn't seem to make any sense. Why make level 15 really, really, really, really hard to beat if it is only one third of the way through the game? I understand the whole "it is a milestone and the last level of normal mode" but really? only one bad guy per wave until the last wave and it is like 40 dudes?
Need more missions, just to counteract the fact that the final upgrades cost over 30000. And with Backpack level 9 waves 31 to 35 only give you like 4000, it is ridiculous. We shouldn't have to spend 13 waves worth of gold to upgrade one thing.
EnixSR's comment shouldn't be considered as an "opinion." All game developers should realize that having special things for people who will fork over cash is a sick and twisted system that shouldn't exist.
Every level started with a despair that I would never solve it, then after putting 2 or 3 pieces together I felt courage and faith and was able to solve them. Nice game.
The controls should have a set distance for each time you press the arrow keys, that way we can know how far it will move, otherwise it is nigh impossible to be as skilled as the game requires.