I was the person who got 100% completion with an hour and 13 minutes game time... so that should tell you something about the quality of the game.
I love the way music fades in and out - it reminds me of Wandersong, especially the town underground. The physics felt unique and took a while to get used to, but considering I got that one coin in the town, I certainly grew more comfortable with it.
All in all, this was a great little experience. Keep up the amazing work