This is an abandoned adventure platformer by Nifflas, creator of the Knytt series (and many other games). Knytt Stories and Knytt Underground were formative platformers for me in the early 2010s, with amazing music I still think about today!
Do check out his old and current work. They range in their challenge level and have a very atmospheric mood to them.
This song in particular I heard really early on when making game music... I wondered a lot how to get such mysterious and calm moods and fumbled around with white noise trying to imitate things. The delayed synth around 1:10 is super ethereal and ghostly, I love how the notes just float in and out.
This song was tricky to track down but I'm happy to have been able to find it again! Enjoy!
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