i managed to do this, but i'm not sure this would actually end up saving any time because you'd still need to travel and collect the third triangle (unless you had another idea?)
also i haven't been able to figure out how to get to where you are in that image you linked. could you make a picture showing where to jump?
that's be a pretty nice use of the glitch, hopefully a fast ascension is possible there!
i originally downloaded it from here: http://raiyumi.com/games/the-valley-rule/ (just press F12 and you can find the dropbox link to the swf file: https://dl.dropboxusercontent.com/u/30606921/LD29/The%20Valley%20RuleNG.swf)
that link seems to be down now though, cause i'm just getting a white screen, but i still had the file on my pc so here's a reupload: http://www.mediafire.com/file/22dqsfwpuc1xnc1/The+Valley+RuleNG.swf
also the trick is pretty difficult, it took me about 5 minutes before i managed to finally do it for the video
awhile back i ran this game for about a day or so and found out that you could clip into top-left-corners if you jump directly into them. i'm not sure if this is known because i haven't seen any videos with it, but here's a video demonstrating it along with an input viewer:
i really doubt this is useful for speedrunning, but i'd like to let it be known that it exists and could potentially be useful
(also it should be noted that there seems to be two types of clips, one with slow ascension and one with fast. in the video is slow ascension, but it seems to be random which one you get. also it's not exactly easy to clip and takes time)
EDIT: forgot to mention, but this was done on the downloadable version played on adobe flash player 22