thank for playing.
as already answered:
"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."
Note that by preserving the health "ratio" there is actual "hreealing involved" but just to the degree of your damage status (half hp added if your unit is at half hp).
more mechanics and scenarios was just merely time issue. I went solo this time as my jam crew was busy.
thank you for playing and the feedback! (btw: the bug is odd, maybe introduced by 4.4, occurs only occasionally)