Carpetwurm is correct. I've noticed it too, and a few side platforms are placed to seemingly take advantage of it. it is a boost due to the way jumping works if you're already moving. It actually kinda makes for a nifty secret IMO, but I do think consistency might be better, plus then a dash could maybe be implemented later for those further jumps perhaps? I can see a lot of potential on this game, so i'll be keeping an eye on it. I love games of this design type as I've been playing them all my life and I would like to leave my compliments at the great visual style and solid foundation this game has.
Yes, I found that out shortly after posting this ironically. I didn't notice it on my first playthrough, all the long jumps I found other ways to get to via the aforementioned manner ironically. I thought it was odd at first but it makes a lot more sense now. I thought some of those out of reach areas were rewards for discovering that little trick at first!
Still, I really love what you have so far and I'll be keeping a close eye on this game. I think it has the potential to be something pretty special.