yes the ghost tile is more of a concept to show off what my engine is able to render (i made quite a cool tile engine in godot for the game - a tech concept). in most modern tetris clones, such a ghost tile is present.
thanks for the idea to make it selectable whether it’s visible or not. i didn’t have the time for a settings menu. i also was thinking about “normal” (4 colors) and “hard mode” (all 6 colors), so you a line more frequently in normal mode.