I like the concept, I found it really interesting and the puzzles were well made. The art and sound design were great, I especially liked the sound of the flute. Playing the flute does get a bit tedious at times, but I also like how unique it is as well. Having to learn and memorize the songs is a cool idea. I don't know how well it fits the limitation, as it's not very unpredictable when the game directly gives you the songs, but other than that I don't have any complaints. Well done!
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Thanks for the feedback! Glad to know the puzzles were ok, I didn't manage to playtest them during the jam.
I kind of considered "not having a proper explanation for each mechanic" as the unpredictable part, and once someone understands it, the predictability feeds into the rules but I guess its a very different interpretation.