RAI you definitely would not be able to target yourself. The spell description starts with: "The touch of your shadow-wreathed hand can siphon force from others to heal your wounds." Technically this sentence is flavor only, but in this case it clearly reveals the intention of the designers.
RAW your meme still works, but I would restrict the spell to target only creatures other than yourself for the reason above. Only if the player has a really cool way to describe how to siphon your own life force and somehow convert it into more life force for yourself, I might allow it...
I have a plumber joke, but it's shit