It is nice that limit break makes your size change more controllable to go through some of the scene variation since before in the old build you tend to able to grow very fast with the sigil spam, however there are now few problems that comes along with the system:
First, it makes the game even way grindier than it used to be. Sure the latest backer build now tripled the limit break point you earned from leveling up but considering you have four body size slot need to invest your point with which is helpful sure but not by a much margin in the long run.
Second, It makes Unstoppable Expansion and any growth related perk essentially useless, on top of there is basically no way for you to use excess essence for other purposes since Unstoppable Expansion is useless nuff said and most of the essence scaling abilities also happened to have a cap so higher amount than that is useless.
Solution: Introduce ability to buy xp/limit break point with excess essence you earn from overgrowth (Preferable option) or rework Unstoppable Expansion and other growth related perk and essence scaling abilities.