I couldn't get a clean play session out of the browser build on my setup, so this is measured off the third screenshot on your page rather than from playing — weigh it accordingly.
Nine of the ten row symbols are genuinely distinct. Flame and Drop are the exception, and they are rows 1 and 2, so they are the first pair anyone meets. Normalised to a common box their silhouettes overlap at IoU 0.40, the highest of all 45 pairs (next is 0.36), and both are a rounded teardrop outline at ~19% ink inside their box.
What I did not expect: each row also has its own ink colour, identical in every cabinet (checked two, within 2 RGB). But it is one monotonic ramp, #C18460 at Flame down to #B5B15A at Crystal. End to end that is dE76 35, yet every adjacent step is only 4.6-8.4 — weakest exactly between neighbouring rows, which is where the eye scans. Interleaving the ramp (Flame, Moon, Drop, Star, Leaf...) lifts the smallest neighbour gap to 17.
Contrast is fine throughout: 4.9:1 (Flame) to 7.0:1 (Crystal) against the shelf interior.
I sell pixel-art asset packs on itch, so weigh that too.