Hi YoHoho thanks for your interest to this thread
Yes I have been doing some observation to many puzzle games especially match-3. Each match-3 games share common things, yet they have different feel when you play them.
For example Candy Crush need the player to swipe over 2 pieces meanwhile Farm Heroes has more flexible control, swipe or tap both are working. Combo/special piece also has different rule. Some games will transform a piece into special one and some other will just add extra attribute into a back plate.
So I pick some features from one and some elements from other and make it my own. The core system alone is complex, changing main rule would be broken some mechanics.
What can be customize are layout design (play-shape arena), score goal, item goal. change graphics (obviously). I would like to add level editor but it is more important to ensure stability.
Next update: combo pieces for extra crush!