Very fun concept, but the cube sequence can be overwhelming, definitely, takes a bit of practice to master it!
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This is a fantastic little demo which is great in its own right. One observation - it was pretty frustrating to find the last object (which for me was the neon sun, for other people it might have been other objects). I scoured the map for it for the same amount of time it took me to find the other objects. And I ended up looking for it on Youtube. So you might want to introduce some sort of hint mechanic to prevent player frustration.
What engine did you use to develop it?