Ah that makes sense. I think you should put some sort of disclaimer of that though ;).
If I would complain about anything I think it would be how inconsistent the challenges are in difficulty. Some I can easily do on my first try whilst others are almost impossible for me without there being any sort of extra reward for beating them that I wouldn't get from the easier ones. Many of the normal challenges are way more difficult than some of the advanced challenges.
I guess that you will put in some kind of thing to buy for the challenge triangles so I'm looking forward to that.
Other than that, almost everything feels really good and I've put it on my wishlist :)
Also just remembered: had some weird things happen when i tried full screen. It was like my mouse was offset from where it looked like it was so it was almost impossible to use my mouse. Had to use the arrow keys to turn it of again. I'm using a windows 10 computer with 2560-1440 resolution if that helps.