Well first of all, are you sure about speedrunning a game you haven't played before? Seems to me like you wouldn't want it spoiled for you, or to basically have the answers given to you by watching the videos.
I'd have to agree with Fionordeguester. The game has a good story and its best to play through everything before you speedrun it. Unless you have already in the past? Besides that, this game is a lot more difficult than the current unfinished speedrun made it look. You might have second thoughts about speedrunning it shortly after playing it. The game can be quite random and very uncooperative. Levelling is key. I am amazed with some of the luck in the current unfinished run. It's a shame it wasn't finished, especially after seeing the amount of good segments in there that require a lot of luck and most of required a lot of restarts on some segments.
If you do decide to speed run it, good luck. I know a bit about this game so should be able to help out on some stuff, but the current unfinished run is your best source of information.
If you do decide to speed run it, good luck. I know a bit about this game so should be able to help out on some stuff, but the current unfinished run is your best source of information.