Since most of the speedruns on PO are done in 1.0, perhaps we could collect tricks for people who have 1.1 instead.

Almost everything can be done with regular jumps if you know how to do them optimally. If you press jump multiple times in a certain rhythm you will gain significantly more distance and height, although its quite a bit harder to do. This allows you to do just about every trick inventory jumping can do.

The only one I can think of that you 100% can't do without inventory jumping is the OoB section after you blow up the debris in the first part of the mines.

I did find a way to get into the OoB section by flying with a box, but it needs some work