Hi, I came across this tool.

https://github.com/hapaxant/AUSSaveParser

I tested it out, and it seems to work. This seems like it could be a useful tool for practice, and I also made some interesting glitch related discoveries with it.

Features of note: Change the room (and coordinate within that room) you spawn in when loading the save file (may be useful for practice). Can also be set to an out of bounds room. Change jump/double jump height, including to higher values than normally achievable. If set high enough, you can pass through ceilings and go out of bounds in many areas. Useful for experimenting with out of bounds. It is likely possible to set health to a very high value (not sure if this is useful for practice)