A nice, easy progression of logic and thought. Nothing too hard, but not too easy either. A little off putting that you have to pick up (in the first case, literally) the codes but all in all a solid release.
Nice touch on the Ludo for coins. However, you really need to lock the mouse if your'e going for an first person ANYTHING, as clicking outside while trying to turn is annoying at best.
1/5 You seemed to have taken one part of Cookie Clicker and forgot the rest. What made that game (and not this... at all) fun was the ever expanding powers and types of auto clicking. This? This is just crap.
I'm glad the idea seems right :).
The good way to get better results is to let at least half of the board (or even 3/4th) blocked. That way you get smaller area to be worried about.
Overall strategy is better to lose points than let a square get blocked. And try not to lose focus when you miss a square or it get blocked.
Other thing thing is to prioritize symbols you go for - the most useful in later game are those four-armed stars (which are clearing a random square). Don't bother if the black star is going to subtract some points and for white-black circles wait until they start to turn green. If you don't feel fast enough, don't even try to get for those fast ones (hourglass), because they aren't even going to block their square.
I'd say you'd do fine without having each piece have its own score value. It makes the whole screen too busy with numbers with them in, and you can still scale the scoring per chain length.
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glad you enjoyed the game