I would like to share some thoughts on this game as we had very similar idea and you managed to deliver so much more. The use of the limitation seems a bit off as the player does not know how frugal should he be when placing the tiles. Limitation per level could be a better option I suppose. The controls are a bit hard to grasp - camera movement could be improved and the switching between moving/placing could be removed.
Other than that I shall congratulate you on completing the game. Good work!