Nice simple game! Enough polish and feedback to understand the game.
Here is something that I felt: I don't know if there are weird shaped expected results if I keep playing, but even o hard, most of the answers ware rectangular, with square shapes for the tile choices. Maybe this limitation came from tech? Idk. For me, after seeing like 10 rectangular shaped answers, the fun was kinda over. For rectangular shapes being formed by squares, the possibility space is easier to manage, as you know for sure that the corner of the answer will also have a corner of the square on the pieces. So, from a design perspective, it ended up feeling more like 'grid check' work than like 'fun spatial reasoning'. Maybe I just didn't manage to get to more interesting levels? If that's the case, maybe more interesting levels should have come earlier?
That's my honest feeling from the game :) hope that helps, specially if you are willing to put a little more work into the project, I would think about this
Anyway. Congrats on the game! o/