itch.io

im pretty sure you put way to much stuff in a single level, try splitting it into multiple acts of levels.. But saldy i dont know how to fix that

This happened to me once when making a level. Only way that I could reopen it was to open the level in V3, but some objects weren't in V3, so I had to replace everything that disappeared (Tip: save every time before you playtest, even if you didn't change anything. Doing that seemed to stop the crashing, so it might work for you)