This was super fun! I wasn't sure how a game of this structure would incorporate teleportation but you nailed it! It works really well! Also kudos on incorporating the online leader board. It really urged me to bring out the competitive side!
I'ma have to echo Kamx on the wall jump issue though. For me the mechanic itself works but the problem is the controls. I guess since so many platformers use space to jump, its just reflex? Personally I found myself spamming the space bar a lot and getting confused when it didn't work or accidentally placed a portal.
Perhaps space to jump and left shift to portal would be more feasible controls?
Otherwise, this game is great! The music really goes with it as well!