Surprised you even posted this. it’s so large and finished-looking that you should wrap a bow on it and sell it. the only real advice I can offer is in the form of scoring
I think for casual and even advanced players, the scoring system as-is works great. but I have this urge to tile the entire grid without stepping on a tile twice. I think having a P+ rating for such clears with some kind of subtle indicator that you’ve failed the P+ requirement (no stepping on the same tile twice the entire game) would perfect your scoring system