Nice. Fun game btw. Played a lot. Also, I think the overcapacity healer is broken. Or I don't know how to use it. Iirc, if you get that upgrade, then the cascade healer stops working.
The healing should still work, but… increasing the health capacity of every node causes earlier nodes to absorb more of the healing, reducing how far it propagates!
So yeah, double-edged sword :p
Okay, hmm that's what I thought. But It seemed to stop healing even after the extra health was full. Maybe I wasn't paying attention enough... Anyway great game! Love the twist on the snake game.