i am unable to recreate this problem on my end but i rebuilded the game with clean build option and also added a 32bit option if you are running that on your system
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I was able to run it this time
I love the visuals and spinning upside down mechanic but I couldn't figure out how to open the second door (I assume I was supposed to put the cube somewhere but I didn't see where)
I was able to fly anywhere by repeatedly pressing Q so maybe you should make it so you can only spin when standing on the ground. I was also able to fly by holding the cube and looking straight down.