It's a clever idea
And it's pretty well implemented, but there are a few problems.
Before the critque, I'd first like to congratulate you on a good concept. Mazes within mazes within mazes is really clever and some of the challenges were pretty taxing. That said, I did just kind of bump into the solution to them and it became more of a trial and error process of elimination after a while.
That is the major problem with it. There isn't much actual puzzle for a puzzle game. It just devolved into trial and error and sheer blind luck some times, substantially hindering any mental taxation that there could have been.
From a presentation and actual game mechanic stand point, the game also fails to impress. The colours are a little drab and dreary, possibly some backgrounds would be a good investment. The only animation to speak of doesn't so much make the sphere look like a marble which is rolling across levels with gravity acting into the screen, it rather looks (with the way the ball rolls) like gravity is acting towards the bottom of the screen. Strange laws of physics in this game where a sphere can defy gravity. That isn't a problem with the game, but it just makes the overall implementation look a little slap-dash.
There is another problem, but this is with the actual controls. Whilst having one button to go up, and one to go down is good for places that have both down and up tiels on the same square, it could be made a little more user-friendly by just having up and down tiles on seperate squares. I often found myself going up instead of down and vice-versa, making me becoming somewhat lost. If you changed it so that there was only a single up or down tile on an individual sqare, you could entirely remove the need to press a button to change between levels. That would've been a little classy. Getting lost is the whole pointof a maze game, but becoming lost due to pressing the wrong button on somewhat clunky controls is not and detracts from the enjoyment.
It is a good concept. That is not to say it is completely perfect, possibly making it so you on the exterior of a cube and can only see one face at a time would improve it, almost like trying to complete a Rubix cube but only being able to view one side at a time. Purely as it stands, it could use some improvements as well. Some slight tweaks could improve it to make it better.
Overall, it is a good idea which has some room to develop. It also works as it is, but it could use some polish. Quite a bit if you ask me.
