Yeah, it certainly needs more incentives to make the size change mechanic feel good. It’s not balanced at all currently. I’ve been thinking about changing the pieces into head/torso/legs instead, and making it possible to make different combinations (either random, or with pickups), and e.g. requiring arms (= torso) for climbing ladders, legs for jumping and moving properly (maybe no legs would make the character walk by pushing off the ground with the arms, and head only would maybe be rolling. Also, not having a head could impair vision, and not being tall could remove the minimap. Dunno. Many weird options.
Thanks for your comment!