This is the most unique take on the theme I've seen. I have a couple suggestions.
Maybe add a thin outline to some of the darker components to the terrarium (I was placing millipedes and didn't notice at first). The song also grew on me, but maybe have two or three in a loop or have a music select for longer sessions (I wanted to keep playing).
Overall, a super strong entry and probably in my top 5 from what I've played so far.