Decent but lots of bugs and needs fixing:
First off feels the tower/nest creatures and enemy ratio was a bit unbalance. The paladin and healers really spam the heals that makes it impossible to kill them once more waves come into the fray. Unless there is some anti-healing spell or creature in the arsenal, then fighting these guys en masse is just asking for a defeat. most of the critters like the poison spiders and skeletons only seem good as cannon fodder, the spiders more useful since they poison the enemies and spawn quickly, but they lack any other attribute to really kill off the enemies.
Second, there are some glitches were my monsters, like my dragon and beholder at a point, wouldn't move for anything. They just simply floated there and allow the enemy units to pass by unhindered at all. There were times when playing in Hard Mode that after winning, I do not get any of the stars I earned and have had to replay it again.
Third the pricing to upgrade your creatures is I guess in a word 'too pricy' you need to earn lots of stars and make a whole stratagem of what to use and distribute the points earn for future campaigns when some of the upgrades really require you to save up on a lot of stars (if that is possible) just for a possible upgrade that may or may not work at all.
Fourth is actually on the upgrades, maybe make those with the heighten cap or no need to spend money on spawning monsters passive or permanently active without having to buy it while in midst game. Especially if the monsters you summon are suddenly glitching and not doing their role.
Controls I felt were so so, there were times the spells that would be picked and dragged to the field would suddenly float there and not activate unless clicked again. When moving the move, there was lag response from the keyboard and certain times when mouse clicking the board doesn't respond (noticed it was when I click the black areas of the maps).
The story itself was humorous, at least as far as I manage to go before I was ridiculously overwhelmed by the disadvantages I was put it; and no refuse to play on easy mode, that takes away from the challenges of knowing how hard a game can be.
Overall:
Gameplay: 7/10
Story: 7/10
Controls: 6/10
Programming: 5/10
Game Mechanics: Needs improvements and clearing of bugs
Good show, and hope this helps.