Sorry for being harsh but for me this game lacks gameplay. It is basically placing units and waiting till they die to drop them again.
The art and sfx are very cool, don't get me wrong but there is something missing, maybe adding different abilities to each creature, different interactions, etc. They're basically the same creep with different stats.
The game is also way too slow for me and it made me not want to play it all through. Also you should make the creatures go around corners in one turn and not 2, make the right diagonally would help making the AI more active because often they were or unable to hit or moving would take 4 turns to hit the creep 2 blocks away.
Anyway, I get that you only had 48 hours but I have to rate you as everyone, but can't wait till you update the game and add all the cool stuff. Great job for a 2 day game!