Welcome to GrowLand
Start small and Grow when getting a kill
Each time you get a final blow you grow in size, you can then controle your size in two way:
Aim straight down and press crouch (ctrl) to shrink once and jump (space) to grow once
Or you can aim straight up instead and press crouch (ctrl) to shrink to the smallest size and jump (space) to grow to the biggest size you've unlocked.
The bigger you are, the less damage you take.
Voices lines's pitch scale with size
Basic configuration available via the workshop settings (orange tab)
Collision (enable by default) create a lot of undermap death when disable
I'll enjoy any suggestion/bug report