Here's a run for an all item collection run I started last summer, progress has been very slow due to many factors, but I'm working on it from time to time. It currently stops somewhere in Brinstar, and should amount to about a third of the game.
It's very unoptimized, both in theory and practice, meaning I miss out on alot of techniques and strategies throughout the course of the run, but it's also very badly optimized in terms of playing. Much due to my inexperience with this game, and alot unfortunately due to lack of planning of weapons management, which looks really bad.
The worst optimized parts are - Beginning -> Norfair.
And the most optimized parts would be - ????
Unfortunately I do not find this very entertaining as a TAS, this game seems much more well suited for a speed playthrough rather than one collecting all items.
There are not much to show off thus far in the game, and even though there are alot of other things that stand out alot more later on in the game, with many tricks and sequence breaks I've not yet shared with the public, it would seem likely to me that this would just end up being a show off of tricks that no one's seen because they haven't even tried, which effect would of course quickly wear off once everyone has seen it.
However there are some new strategies here and there for getting through the game, and alot of them blatantly stolen from other runs of the game. Please do fast-forward the boss fights though, they are terribly inconsistent.
Because of the lacking interest in this game there are also alot of rooms missing any kind of strategy, and so I've had to make my own. This is unfortunately not my strongest point, and it's obvious I'm making alot of bad choices in the run. However the absurd rerecord to optimization ratio is of course subject to my testing.
Anyway, I hope you can enjoy watching this, and it would be great if you could leave any kind of criticism to whether or not you think that this would be a run worth finishing or not.