Thank you for your feedback, and sorry for my late reply. I was busy these days.
* Yes,the nodes are rotated by code, I am using HaxeFlixel library from Haxelib. I will test performance with rotated graphic's method.
* For multi-touches to control scale, I has thought about it but I can find build in support in Flixel, I might try to implement myself.
* I used FlxInputText to input number of nodes and players at first, I work well on flash but the FlxInputText did not work on mobile. So I have to make a label with two incremental/decremental buttons.
* And your other feedbacks are nice, I will try to add some of them in the next version.