thanks,
in the initial version the growth just increased max health and thus "healed" because the damage was merely subtracted from there. In that version I felt like the game was far too easy and could not get the balancing right.
Preserving the ratio felt more correct in that case as there is an implicit heal attached but not as strong.
You found the audio bug. Me too. This is super strange and maybe introduced by 4.4 as I took over some code from a previous project.
Thank you for playing!!