Creator side
When you submit a game, you can set Accessibility features in the Metadata. Among those, I always stumble on Color-blind friendly and High-contrast. Most of my games tend to have clear colors, but just because I use proto art. And most can be played without relying on colors at all.
In other words, I didn’t do anything special to meet those criteria, but it works, although not as clearly as games specifically handling them. There is no option to swap the color palette, for instance, so colors don’t shine either under certain color blindness.
Should I still check those Accessibility features for my games?
Player side
Related to the question above, as a player, when searching for games having Color-blind friendly and High-contrast games, should I expect games who specifically catered for those (by either adding an Accessibility option, or by having the default graphics/UI verifying them), or any game that are OK to play when color-blind / not distinguishing low contrast?
I’d be tempted to say option 2, as the player won’t care as long as he/she can play the game, but I don’t want to mechanically check the boxes for all my games and spam the accessibility feature filter with games that just happen not to be terrible at it. Maybe there should be 3 levels (not good, OK, excellent), but I guess that would add more complexity to metadata for no visible benefit?
An example of filter, which seems to tend of the side of option 2: https://itch.io/games/accessibility-highcontrast
Bonus question:
I got the filter URL above from a search engine, but how do you add an accessibility feature filter from the UI? There don’t seem to be part of the tags (same for languages, btw).