The game is technically good and also I liked the sounds very much. For me I had to many tries in the first three, four levels and frustration started early. I suggest to make it easier at the beginning until a new player understood the concept.
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Thank you for playing, and sorry that it was a frustrating experience. The game needs some improvement regarding movement and time management. Making both of them discrete would be a benefit, as I see now. The grid-based movement just fits better. And instead of time that constantly runs out, it is better to have some “stealth scale” that runs out in a discreet way when the player performs certain actions or leaves too many footprints.