I like the smooth and roomy reverb in this track. It doesn't remind me all that much of rain. Instead, I imagine staring into a large and perfect crystal geode, similar to the ones in Minecraft.
The instrumentation here is good, but I think the song takes a little too long to progress to its more intricate harmonies, and by the time that happens, the song is over. I think this idea would definitely benefit from an expansion into a more elaborate song.