[Sonic ROM Hack] Sonic 2 XL - All Emeralds (Sonic Alone)

This was utterly frustrating to go through. Especially considering I deliberately went for Chaos Emeralds, which involved a lot of rings.
Onion rings.
The kind that makes Sonic comically obese in this hack.
I want whatever the creators of this hack had when they thought of making this.
It even seems like they actually sorta thought this out, considering the presence of instant-weight-loss monitors in some of the later levels.
As for other criticism for this hack, I felt that the exercise criteria for losing weight was hard to understand and occasionally impracticable. You REALLY need to be careful when playing this hack, if you're going for rings.
Additionally, speed attribution with Speed Shoes can get all screwed up, and lead to negative(!) speed settings in some instances.
Download link: info.sonicretro.org/Sonic_2_XL
Chapters:
0:00:00 - Beginning
0:00:20 - Emerald Hill
0:20:56 - Chemical Plant
0:39:58 - Aquatic Ruin
0:44:04 - Casino Night
0:57:00 - Hill Top
1:05:09 - Mystic Cave
1:10:04 - Oil Ocean
1:19:37 - Metropolis
1:34:26 - Sky Chase
1:36:37 - Wing Fortress
1:39:30 - Death Egg
1:40:45 - Ending and Credits