A very interesting concept executed fairly well with a few small problems.
You achieved the two-colour requirement very well, with sprites having more than enough detail to understand what is happening, and the theme was followed excellently. Avoiding obstacles and navigating levels was fun.
However, I did encounter a few things that made it difficult or impossible to continue. The placement of the obstacle and moving parts in several levels made them very difficult to complete, upon losing lungs and suddenly being under time constraints the levels were nearly impossible to complete without losing at least 2 hearts, due to a lack of time for obstacle avoidance.
I also encountered this error upon completing level 8 which stopped the game running.
"An embedded page at html-classic.itch.zone says
An error occured running the Unity content on this page. See your browser JavaScript console for more info. The error was: RuntimeError: null function or function signature mismatch at https://html-classic.itch.zone/html/9125576/Build/Body%20Parts%20Madness.wasm:wasm-function[34471]:0x9a0ce1"
Overall, a very interesting idea that was unfortunately limited.