Hey, thanks for the feedback! Yeah, apparently I once again underestimated the difficulty of the puzzles by quite a bit, my bad!
We did want to incorperate the Rubik's cube as it was one of the first things that came to our mind when we heard the theme and because it was something neither of us had ever seen before in a game, but I think there are also somewhat similar games that stick to the 2D plane if that's your cup of tea. Not entirely sure what's the best way to find them, though.