I love this and would really love to see more customization as to how Rev grows (i.e. what grows most and how fast). I know this is in rather early development, I def have a few things that I'd love to see (that are likely already planed).
I'd love to see more accurate animations, and less clipping, like ducking under doorways. and I'd love to be able to play ;3 with Rev, speaking of which I'd love to see more interactability with Rev, like more dialogue options and stuff like being able to feel him up.
on a matter of personal opinion I'd love to be able to make Rev fat too, but that's just me (but it'd def be hot)