The poop death near the start is unusual, but not that bad. People make a mess when they die, so that's fine.

Not reading a contract and laughing your way through everything is confusing (it's much harder to understand what's going on when one half of the conversation isn't playing along). I personally don't like dumb characters, but you get a freebie here. If you want to write a story about reincarnating as a rock, maybe you need something dumb to happen. So I'll forgive that.

Due to time spent as a rock, our protagonist gains a split personality. This split personality then immediately starts wasting resources. 

So, negative point number one: the protagonist is an idiot. Or at least holding an idiot ball.

Negative point number two: The story rambles on and on. Paragraphs keep going without end. There's an interlude about what's going on in the original world, and it has no line breaks. Just an endless stream of poop jokes. 

Whatever value the plot had died with that interlude.

The story gets worse after that as the protagonist's split personality induces a session of talking to yourself. They're given symbols, rather than names. The rambling turned incomprensible for me there.