Being Rain in the Paper Mario Modding server in 2022 must be difficult, I think I wasn't alone in having high expectations for this mod. While the result ended up being quite good, the crunch you two had to go through is very clearly visible and it's clear a lot of stuff was removed.
Let's start with the presentation, which appears to have been mostly MrN's territory. The sprites were all excellent. I absolutely love the Paper Mario-ified BIS enemies and NPCs. The writing was very in character and also quite funny, it's clear a lot of thought was put into that. Finally, which one of you was responsible for the battle theme? I've never heard custom music implemented this well in any Paper Mario mod.
On the gameplay front, the battles were fun but also very simplistic for the most part. The final battle against the M & L memories was absolutely stellar, though. The attacks were very creatively adapted from BIS and it was a good challenge.
Then there's the segments in between the battles, which is where Rain got a chance to flex a little bit. This is why I mentioned having high expectations, because Rain always manages to make really cool tiny additions to the game's mechanics using ASM. For this mod, the additions were quite minor.
The first segment deals with a Spin Jump, another idea taken from the Mario & Luigi series. It's a clever way to add some extra functionality to the spin jump, and there's some tricky challenges to go along with it. The second segment gives Mario a Hammer Throw ability to use in the overworld, and I can't stress just how happy I am that Rain finally brought that back after showing a short demo of it several years ago. Still, I was expecting a lot more, especially considering the cool stuff that he made for the Christmas Special which had a significantly shorter development time.
Overall, this mod was a short but really fun experience, and you get bonus points because I love Bowser's Inside Story so much.