I try the " run away first " then I did the level and get on the sphere, get a cinematic and die ahaha :p !
Viewing post in Grapple Hearts jam comments
You may want to try collecting the cubes until a ring icon appears in the top right corner. That's how you can unlock the other endings.
I thought about changing this design choice because it would stop some people from seeing the other half of the game (and maybe get a bad impression of it too).
Thanks for letting me know!