Very good.
Could use some more UI clarity or information. Didn't understand if I had to equip my Powerful kicks thingamajing or not. Also might want to have some kind of confirmation on destroying something as I then accidentally destroyed it.
Interesting. Didn't finish it tho due to a bug.
If you back up to wall while holding a cube, the cube will appear above your head(?) or inside of you, not sure which, but if you release the cube in this state at a door it can go through the door. Also the sfx got really annoying, especially the seqCube(I think thats what it was called), sounded like an alarm clock.
Other than that good job!
F when you are standing in front of it. The button on the HUD should light up and a selector become visible when you can interact with something like the crystal, items on the ground, or doors.
If you are still having problems can I ask that you take a screenshot of you standing in front and facing the crystal or items? I have never seen this problem before.