I liked this game and had alot of fun playing it. That being said, there are a couple of things I see that need some improvement.
1. There comes a point on the later levels where you are just destroying the enemies with only 2-3 maxed out towers and you're pretty much on auto pilot. Occasionally you're upgrading a farther back tower once you have the skill, but you don't really need to. The last round kept you engaged by clicking on the bombs, but thats the only one. I'm sitting on 3,000 money and nothing to spend it on.
2. There should be an option to start more than one wave at a time so that the later stages can move along faster and make them more challenging.
3. I think that the scrolls should be something that you pick up and can use at a later time. Maybe even have them be something you can buy with money. There are just times when they drop in a useless spot and can't be used at all.
There should be a way to rotate or better choose what position the guys have so that if you got 2 melee and a healer you can put the melee guys infront or closest to the enemy.
This game utterly suck!!!!!!!!!!!!
You can't move worth a damn, the aim is all off so you can never shoot where u want to, and you can't control when you stop and start shooting. Whoever made this needs to trash it and start all over again.
Heres how I beat Final Challenge Epic. I loaded up with all the cheapest melee units I had sense the big yeti has a blind spot up close. The big yeti can destroy your castle from far away, so I used bodies to slow him down. The time stop wasn't as effective. Keep using invunlable to get ur guys close to the big yeti. The tower will damage the big yeti, but you may not want him to get that close. Like most monsters, if the big yeti gets low on health, he'll retreat. I didn't kill the big yeti, but I managed to keep him close to the castle so I could destroy it. In short, use lots of numbers to zerg the castle and you'll ware it down.
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 "Incursion"){kind=icon}
 "Shoot Pixels"){kind=icon}
 "Epic War 4"){kind=icon}