Thanks for suggestions Red. It is great to get them from someone who just stumbled on this without any additional info. This is one of the reasons for this demo/preview.
Some of the things you mention are the reasons I've put it in "work in progress".
Sound is still evolving. The sound responses are definitely not there yet. most of them are too laud. They are there more for mechanics then the real thing. The music score will be expanded, so the looping will be more seamless. There also will be the musical finale.
We will add scoring system and rewards. We are considering an end where the ball will open up on completion and coins and other winnings will fall out (free time tokens, free cheats, some joke items like rubber duck, or banana and so on)
The mistakes -- I am of two minds on this... On one hand the original sudoku allows you to screw up, on the other hand this is exactly where a lot of people get turned off from the game. So maybe this should be an option for an "Expert mode" -- no cheats, no stopping of mistakes.
I've been playing sudoku for several years and had some random conversations with other players, the comment you hear the most is: "I hate it when I screw up -- you can basically give it up at that point". Working on paper there is no way to prevent screw ups... With computer program there is a way. Besides, does Spheroku(TM) need to be slave to sudoku
Trial an error learning is not a bad thing. I imagine there are much more people out there who are weak at sudoku then those who are experts. The colors are less intimidating then numbers. Spinning the ball is more fun.
Since I am almost done with the mechanics, I will be able to concentrate now more on fun and aesthetic side...
The end rotations are there temporarily as a visual feedback... For me it was necessary for testing on devices to make sure that in the background everything adds up. I realize there is a great opportunity there to make people love the game more since solving the puzzle always gives you a little rush -- We will try to capitalize on this...
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One question -- did you find it easy or difficult to use the interface? The 3 levels of difficulty -- what do you think? Will people see the easy level as easy?