Super innovative idea! I liked it a lot. Sadly, the 1-hit death + very few saving points threw me away but I wouldn't have mind to keep exploring which new mutations could come. There is a lot of potential in the concept, well done.
As for some feedback, maybe it was a bug but a bit of music or sfx would have been nice. The progression is slow but fine afterall, and the levels give a metroidvania feeling for sure.
Overall, great entry!