While I can understand the complaints of people who don't speak English natively, I really don't think this game is very difficult at all. I might've even suggested steepening the difficulty curve. :x
Actually, dire, that's one of the things that impresses me about the game. By offering more money to those who can't defeat an enemy quickly, the difficulty becomes adaptive to the player. Those who need the aid get more money for stronger troops and upgrades, and those who can master a level in a short amount of time are offered more challenge.
The "accuracy" problem (I assume that was the premise, and not just a glitchy game?) with the M4A1 was a real turn-off. Having to plug out several shots with no result before killing my target was a pain in the ass. If there's an accuracy quotient, the player should have a skill control to respond to it - ie a wobbly reticule so you have to shoot carefully or being able to see the way the shots veer so you can correct for it, rather than random non-hits.
Scratch that, I can consistently beat him (after you take him to skull form, try and stay a good distance from him to make avoiding the fireballs easier, once you have the lance you can just wail on him as he flies by without worrying about his attacks) but I can't figure out a good strategy for doing it in 4,000 frames.
I can consistently cut down his beard, but that Skull's pretty tough. Fun game though, I'm really enjoying myself. Personally, I think you should regain your health (for that life) when you level up, but I suppose that might make it all too easy.
This game has a bad habit of spontaneously killing me in Survival mode. I'll be defending myself and my base when I instantly die (without being hit by a zombie, and with my base often with full health.)