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I didn't have much time to play, but I like the game so far. It reminded me of a more advanced "Age of War". Anyone ever played that? It's kinda short, but it was one of me faves. Anyway. You took it and made it into this crisp game here and I appreciate it. But, the game does have some flaws.
Unfortunately, I can't tell you at the moment because I have to go, but I'll comment later after I've played more

I agree with candalas it needs a speed up button. It gets a little slow sometimes

lacks a speed button

Arsum

It's a nice game you've got there. You re-used most of the good ideas this genre of games have known such as experience to unlock more units, levels with skill points to unlock perks, etc...

On the bad side, you need to rewrite some of your texts. An example would be : "Know gobelin has ever seen his face". I think you meant "No" instead of "Know". Though this didn't really influence gameplay - it's about like refining your game - some people might consider skipping your game altogether if you let these little typos fly by.
Like most already commented : it's really too bad there is not keyboard shortcut for the hero actions, and no way to control your troops movement. Sure that would make later difficulty levels harder to program because you'd need to make an AI that has a strategy to make it perfect, but that's just the thing : the player could use that strategy too. You could build up troops to stand by your castle and then send them off to battle as one big army, or even wait for your hero to launch an attack. You could have them old off enemy troops at this advantageous point of the map (I'll come back to the maps a little later on).

Now, the good points were that you had multiple heroes with different possibilities, but get only to choose one, thus altering your whole game experience.
The maps were different for each level, which isn't seen much in the genre. It would have been even better if you were able to command your troops movement to make use of said customized terrains, but I've already expanded enough on the subject.
Now another good point was the story. Sure it wasn't a big background with lots of twists, but it was still much, much more than what this type of game is used to. I'm a fan of old games, and most of them didn't have much more of a story that yours do. A little background was given, mostly finishing by "And it's up to you, the player, to win !", and this is sufficient. You didn't overdo your story, and still didn't overlook it either.

In the end, I'm giving 4.5 stars to your game. You deserve them. You game is coherent and pleasant to play, doesn't overstep its place as a little flash game to become a level-grind fest. In short, it's not perfect but it's fun to play, and as such I'd say it earned its place on newgrounds.