there isn't a way to let the player customize mobile keys. Can you explain what's wrong with the buttons?
Is there a specific stage where there is lag?
I'll premise this in that I don't recall what game (or games) they were but there was definitely something I played that allowed the player to actually reposition and resize the orientation of the buttons.
I may not have been built in unity though 🤔
I think one major issue is the blue arrow for the next stage.
It ends up directly between two attack buttons and thus often unpressable.
I think the next stage arrow being near the top of the screen would be more accessible.