Alright, level 15, and played with the pad.
I start to have difficulties. Before level 11-12 maybe, it was only a matter of "going", now i actually need to think first, and it's good.
It's easier than keyboard, indeed, but why ? The confusing part is about the different keys to move, and to select direction of activated nodes. Why is it not simply the same up/donw/left/right instead of a/b/x/y ? Worst with keyboard, where i need 2 or even 3 different blocks of 4 keys (like wasd, arrows, jklm...). Also the camera not being straight north/south... doesn't help. Not untuitive at all, and confusing, even if you can *learn*, it could also be easier, more obvious, i think.
The hacking part is weird at first, for the same reason, but it becomes a little easier with some practice. I would expect to move over the tile i want to move, confirm, then move, all with 5 buttons/keys maximum, not 8. Same with mouse, just "click the tile", then drag or click on destination.
I'd like to undo last action, instead of reset the full level.
I do like the game so far !