Idea behind the game is original, fun and cool and, although i didn't had time to finish the game, i loved what is next according to what can you buy on the shop.
There is not much i can add that other comments didn't say before. First steps on the game are maybe too slow, but as you stated, you didn't had time to test the game, so sure you will improve easily.
Just a couple of things that i think are important: A volume/mute sound control (i couldn't find any) and don't let the player to place the exit inside the walls: Hero gets stuck, he never can reach the exit, and there is no restart button, so i had to quit and start again the game.