I love this game! The hiding mechanism is great, the art is great, the mood is great! It is a bit difficult, but in a good challenging way, the end is really rewarding, although I wished I could play ten more levels :) I think adding a timing component to the tracing mechanism (to make it difficult to just wait closing the shape) could make this already fun and unusual (at least for me) gaming principle an experience one could spend hours on. Especially with such creative hiding places you came up with, like the [spoiler ahead]
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Thanks for making this fun little game!