Nice game.
Many times I got the same answer and questions in a row. Maybe it was just my random unluckyness.
The game does not offer much more content after a while, so could have been made shorter. I think about after 4 levels I felt ready to stop playing but played the last levels anyway.
Some enemies does not align to the grid correctly, and there is some clipping and tear in the tiles and mini map.
Movement could be made a it more fluent. If you tap to quickly it gets unresponsive.
I liked the music and the riddles were generally fun. Keys and doors could be made a bit clearer. I found myself looking for a black key, cause the door looked black, then I found out I could open it with the blue key etc. the 2D key item could be 3D to make it prettier or change the 2D billboard thingy.
UI is generally ok I think, I like the font.
Thanks!