The additions i think you should you make are:
*Sell button for towers.
*A variety of skills that we can buy and upgrade.
*More units to choose from.
"TIP" ONCE YOU GET DRAGON TOWER THATS ALL YOU'LL NEED.
honestly, game sucked. all the guns were the same, nothing exciting about the missions or that required any thought. point and shoot. good idea but can use a lot more creativity.
Impossible took me 26:02. its a good time killer, also the game is good. but can be way better.
Add more levels.
Let us choose our heros. (Also why is there a cooldown for the hero as well as the spells when we get the exp. to unlock them? Very unusal)
Instead of 1 cannon tower, why not have different types of towers that can be bought and placed around the caster or on it. (just an idea)
Game is fun, but you really need to learn how to balance the amount of money earned during a stage and the items to buy. You did a good job on the game except that part, also have some life pots drop from time to time. LVL 16 2400 FOR 1 LIFE POT IS RIDICULOUS
Game is great. Simple and fun. If theres a sequeal, add some more levels, and also the difference in the price of bows jumped to much might want to cut that down. Also, if you made arrows drop during the levels that would be useful, since deplete so quickly. BUT AMAZING GAME. A+++++
Great game. Only modification I can think of is when you send men out to capture a building instead of the extra men that were sent, that slowly die off because of the cap limit of the buildings they can be added back to the buildings they were sent from. Also, the little man singing at the end of every victory is priceless. Click + if you agree.
The game is great, but you could make a lot of minor adjustments, and most are already stated in the comments. One recommendation I have is that make the AI smarter. The hero will still do his 5second attack ritual even if another unit has the killed the monster that was in front of the hero, and also please do something about the timed attacks very annoying to me I don't know about the rest of the forum.