I built the ugliest cubes but it was very fun!
This is the most original entry in my opinion. Both in terms of tech and in terms of what you had us do to be able to play the game (it wasn't easy explaining to my flatmates what I was doing with paper and scissor on a Sunday afternoon).
The concept is very cool and would be nice to present to children (including the building part which is fun in itself!) I think you had a great idea and I can't add much to it, so I'll just talk about the execution.
I like that the app itself leaves most of the screen real estate to the camera, and therefore the cube, and that you've incorporated feedback straight onto the "virtual overlay". Regarding feedback, it would have helped to set a different color for each cube because the shapes are not the easiest to remember (they're pretty though!) and I got confused with which one does what sometimes.
The songs themselves are nice, but maybe too hard in the sense that sometimes the clashes were not obvious. Picking extracts from songs with different tempi and avoiding neighbour keys would have helped make the clashes more obvious (I am a musician myself I should mention).
I like that you gave us a backup virtual version of the cubes. It would have been fun to have physics applied to those but I'm aware of the complex camera work that would be required in order to make that usable.
The printed cubes seemed very small to me. They are cute, especially with the graphics, which fits the name. But my fat fingers would have liked to put together and manipulate something bigger, maybe multiply the side length by two. (my printer is calibrated yes :P) But hey, you're saving paper so thanks for that!
Overall, it was a nice little concept and my first AR experience I believe! So thanks for letting me in your world for a bit!
I look forward to seeing more games from you! Until then, take care!