Great game. I love these kinds of games. Not graphically intensive and is pure number crunching but if you are like me who likes strategy games, gameplay>graphics.
You don't really need a titan to beat the colossus. Just have 2-3 fast spawning+fast moving units and 2 ranged units that have decent movespeed to kite the colossus. Once the colossus have enough range for your range units, just move them back a bit and continue chipping down his hp.
Colossus is actually the first trial I beat XD. Just kite him with ranged units (I used gorilla and centaurions) while letting melee units spam. I think I used vampires, bombers and paladins on this one. I've completed all the trials except the swordsman. I know the trick to beat him... just not the patience x.x
Also, like I said in my previous comment, the UI can use a bit more improvements. Progress bar (tracks where your hero is currently at like a minimap) in the lower side of the screen beneath the right move bar and spell shortcuts in the top of the screen or the bar between the arrows. Shortcuts would be very useful, saving you from a lot of clicks. Another suggestion is quality button for the flash version. After I experienced terrible lag fighting the epic fortress I have to give up and refresh my browser wasting my effort on getting it to 1/10th hp. Final suggestion would be being able to use the unlocked items OR units on other heroes. It would increase the usefulness of "great but useless after the "normal stages" units and can provide a lot of replay value.
Okay, managed to finish the story and the extra. Now doing the trials (though it's freaking hard lol) so I think I can now suggest things. First of all, I like most of the things you changed from previous epic war games. Those made me like this one a lot more than the previous ones (I even favorite-d this). First suggestion: passive spells. So far I haven't seen passive spells like auras, etc. only number crunching passives that increase dmg, hp and number of units. I think it would be nice to have passives like auras that provide +atk, + atk/move speed, +def ,+mp regen, or hostile auras that damage enemies, give -atk, -def accuracy and etc. It would be nice especially since the mp is shared making a lot of skills useless. Passive spells would also make the heroes worth using after the "normal" stages. After that they become useless and i just leave them at the start of the map because if they die, it's gameover.
I've never really liked the previous epic wars. I thought it was bland since the gameplay is the same, you get your units together, then attack full force. The only redeeming factor was the epicly detailed art. Epic War 5 is a bit different. Adding the skills to the summoned units add quite a lot gameplay-wise and I quite liked it. I think the improvements are better this time. The story and UI could use a bit of work though. I suggest having small skill shortcut buttons on the top part of the screen and a small progress bar (like the minimap from the previous games). I would also like to see how some of the mechanics work like how do monster acquisition works, items, exp, etc. All in all I think this is a lot better the old one (though the art isn't as epicly detailed as the others) and it's heading in a very good direction.
Very solid game and I enjoyed it quite a lot. Controls took a bit of getting used to but it wasn't much of a problem. There's a lot of room for improvement graphic-wise and gameplay-wise but the main game is pretty good. I don't know why it's rated low.
Ah finally finished it... but I don't get the ending. The game is great but there's still some bugs lurking around. The ones I experienced were the bad lag during the horde attack in the bridge area and the "g" function sometimes not working. I think it stopped working after I inspected some notes/post in the wall making me unable to revive my downed teammate or swap weapons with them.
Too easy, too short. I like the micromanagement part. It has a certain feeling like one of nerdook's games. Nicely done but it's too short and have little replay value. Ranked SS in my first try. >.>
 "Monster Arena"){kind=icon}
 "WarLight"){kind=icon}
 "Epic War 5"){kind=icon}
 "Gray Mage"){kind=icon}
 "Planet Defense: G10"){kind=icon}
 "Vector Stunt"){kind=icon}
 "The Last Stand: Union City"){kind=icon}
 "The King's League"){kind=icon}
Noted with thanks :)