Really loved the concept of the whole game and I thought the levels were really nicely designed. The art style was great for the setting of the game and I loved it.
For the gameplay while interesting there are a couple things I had issues with, I was not sure how the hour glass worked at all for the first 3 levels, that could have been explained better - Or I could have just read the description I guess. Another thing was that the game could maybe use a grid outline, because at times I did not know whether I could move forward from the obstacles or not, but that is a design decision so up to you really.
The audio I thought was fine, however I wasn't a huge fan of how it restarted each time I reset the level, maybe that is just a me problem.
Apart from all that, it was a fun puzzle game.