Hey, thanks for taking a look at the game for me!
The bulk of the text needed to make the game playable is snug inside of SLPS_250.94
If you check in a hex editor, you can find the lot of it starting at 000DE810, and just slowly scroll all the way down. I imagine some of it is split into blocks, some trickier than others, but if you could dump the entirety of that particular document, it'd already be a strong starting point. That's sort of all I know, but it includes things like controls, particular dialogue, sound tests, menus, etc. I hope that helps!