Thanks for the feedback. I thought about colorblindness and figured it wouldn't matter since the important part is the brightness, not the hue. Is that not the case? But anyway that said I'm now kicking myself for not realizing that that doesn't help with differentiating the green for correct... any ideas on how to address this?
Try to pick more intuitive colours if possible. My first guess had both dark and bright red, and I wasn't sure which were closer/farther (had to reopen the site in incognito to get and read the instructions again). A more intuitive gradient (perhaps between just two colours, e.g. white and red) would remove the need for instructions.
You can tap the question mark in the top left to see the instructions again! But yeah, I can see how the color scheme might be confusing. As Kluggy suggested, I might add a gauge on the side of the board which should help prevent that mistake
Tour browser's (or at least Firefox's) devtools have an accessibility tab that allow you to simulate colour blindness. You can use that to play around until you find colours that work.
(Fun game btw! I like how this completely changes the dynamics.)
