The ambience of the rain and thunder in this track was really perfect, it gave a very calm feeling to the track. The synth you used for the melody felt very neatly muted for a rainy track, with a good cutoff filter. The drum loops also made it very relaxing in addition to everything else. My only suggestion would be to vary up the melody a bit since it felt a little repetetive, but otherwise this is really nice! Love this work, keep it up :)