Blockperson in Cubeworld: Attempting to speedrun my unintentionally kaizo platformer

Years ago, while learning Unreal Engine 4, I made a game that was supposed to be a chill, cozy little puzzle platformer (failrate.itch.....
Unfortunately, my newbie level design is consistently slightly off kilter (e.g. platforms just slightly too high).
In addition, there is a random crash bug that seems to happen after only a short time playing.
Triple misfortune: Even if I had the original source for the project, it had somehow become corrupt and would no longer load in Unreal Editor.
I attempted to speedrun (Any%) it recently, and all of its issues make for a very frustrating time. Even using the "N" to skip level cheat did not give me enough time to pass one of the later levels. The game crashes too frequently.
Not even going to try to get all of the floating blocks, because it does not unlock anything, anyway.