Played it. Clean spine: one tap, no take-backs, five boards, and the loss screen names the row, the column and the rule, so a misread teaches instead of just stinging. Sizes staying small keeps it attention, not squinting.
The crack is the colour boards. When the rule is 'every row repeats the same colour order', hue is the only signal, and two of your three swatches (--a #6f9bd6 and --c #c98bd6) share nearly the same blue channel and differ mostly in red. That is exactly what red-green colour blindness flattens, so a colour-blind player can face a board they cannot solve, and with no restarts that ends the run. A redundant mark (outline, dot count, a letter) on colour boards turns eyesight back into attention.
Second, smaller: the loss shows where the breaker was but not what that tile should have been, so the one thing you cannot learn from losing is your actual error.
Good thing: 'quitting counts as the loss' is a great rule for a five-call nerve game.