I really don't know what you want? we already have both dashes and double jump(including able to use the dash in midair too, as well as jump attacks with melee weapons, and the mystic even have a blink ability too. Seems like a good amount of options to me already
I don't think there is a hard level cap, specific to the demo (though the xp gain tapers off relative to your level, so it is a lot of effort with the current avilable monsters to gain level's eventually), my lvl 16 mystic have I think it is lvl 3 blink, which is pretty darn fast already
EDIT: Actually lvl 16 Mystic have rank 4 blink, with a 0.31sec cast time, and it says indeed at rank 5 that it will be instant cast). which already at rank 4 is fast enough that I can cast it between the "cooldown" between 2 dashes already