Pretty damn good! The anxieties of a platforming challenge paralleled with the anxieties of talking to an old friend is a really cool concept, especially when you're trying to vertically scale a level (and how you have to scale it slowly at first vs. quickly later when actually saying hi). The falling down event is also very memorable, really nicely conveys that exact feeling when you miss the timing by just a bit.
Writing was also pretty good. It sorta broke my heart towards the ending but the general messaging was quite solid- maybe integrate text into the platforming blocks? Wished that writing was more integrated into the level design itself.
Intro levels were pretty well constructed, faithfully following the Mario logic of "introduce a mechanic in a safe space -> elaborate on that mechanic with risk -> further elaborate on that mechanic".
Bouncing ball to double jump felt a bit too tight on the timing, but it definitely conveyed that rushing emotion/confidence- again, conveying emotion with level design. Very very well done.
I've learned a ton through this game- hopefully we can collaborate in the future!