Great sound design here. I like the water dropping and vibrating squealing quality of the lead. I also think the amount of reverb is very fitting. The beginning of the song with the absence of measure marks and some discordant notes here and there gives a timeless mood. My only critique would be that, lacking contrast, the ears start to grow tired of the aimless roaming with no point of reference to grasp. I understand this can work extremely well as a pure minimalistic ambient, but as a song, elements such as the variation in timbre that appears around the 4 minute mark would be needed earlier to keep interest and a sense of progression.