Thank you so much for the input! This all really helps a lot. I've been taking feedback from a few friends as well and I've found that that particular puzzle you are stuck on definitely needs a timeframe extension. I think while testing it was easier for me because I was already so comfortable with the teleportation mechanic.
I've got a small update in the works that's gonna fix a few things. There is a glitch involving the colored orbs not being "set" properly sometimes, also I think it's a terrific Idea to have some more visual feedback to tell when exactly that happens! I'm also gonna look in to saving more preferences into the save file as well.
Also I'm glad you've enjoyed it so far! Again all this feedback really helps so thank you so much! :^)
PS! The update should be coming in a few days/weeks. HOWEVER In the mean time if you want to progress past the mastery of space puzzle you can easily modify your save file!
C:/Users/~your name here~/Appdata/Roaming/Ghost_Story/file_~your file number~.sav
You can open this in any text editor and look for 'flag_6' and change it from 0 to 1!
Doing this will open the above door that would've been opened by the key that puzzle dropped. It will also mark that puzzle as completed.