Lack of appreciation is something I don't really agree with, but I can't wholeheartedly agree with the anti-downraters either. We have a rating system in order to classify games, and for it to work, there has to be some sort of criticism. It we rate based solely on the developer's effort, every game would get a 5/5 from everyone... Unoriginal gameplay, high difficulty, among other things, are factors that do affect my enjoyment of a game, and therefore I consider them valid as rating criteria.
In the start, it would also be helpful to have some sort of HP indicator. It gets very hard to know when to go to Pandora Plains, for example, without one.
I don't think the enemy knows where your stealth tanks are. I completed map 5 fairly easily by launching an attack on the warmachines with my stealth tanks...
My problem is not exactly the typing as much as finding words to type... Games like this are cruel to non-natives with bad english (read: me), but I still find it fun...
Unless, of course, someone actually doesn't like this game, and have the complete right to vote it 1/5. Just because someone downrates your favorite game, doesn't mean they're noobs...
The movement is a bit cumbersome, but the game is good regardless. I like the fact that you made each level with its own unique style, instead of repeating enemy sets.