If you base the game in Heaven then everything is already dead, so how can everything die or is this the mechanic to get things into heaven with you? Or if something dies in Heaven, where would it go?
I was thinking the exact same thing.
Here are some examples:
Visual and/or Audio euphoria would be heaven. A giant pile of ice cream, depending on the person, would be heaven. Kittens everywhere, etc. I waisted too much time on trying to build my complicated idea I had to withdraw, next time I'll just stick with something simple like an HDRP Forest to explore and made an educational game out of it.