Yo’ Templar here, the puzzles in hard mode were quite good, the black and white colors really help with the time backtracking idea, my biggest problem would be the music, which seems to become almost exponentially annoying everytime it loops, which exarcebates the trial and error of the early stages where you still haven’t fully grasped the mechanics.
Somethings to note would be:
Altough black and white as I said really helped with the idea, it’s difficult to pullof without a good amount of skill to make the scenarios eye catching or memorable.