It's a hassle to come up with a cover image that can also work cropped as a twitter card!
Also, for the profile page, the twitter card image is the one of the first game listed. The profile avatar or banner would be a better fit.
*bump*
Am I the only one trying to tweet about itchio games? Looking at the main page, 9 games out of 10 will look bad when their page is tweeted.
If you don't know what I'm talking about, go there: https://cards-dev.twitter.com/validator and paste your game or profile page. you'll see how it ends up when tweeted. You can always center the cover image for your game so it's not cropped badly, but the result on profile pages should be considered a bug in my opinion.
Hey, sorry about the delay. I just added a new image uploader to the "Promo images" section in Game Edit > Metadata that will let you provide an image to use for social metatags (twitter & facebook). Tell me if you have any issues.
The logic for profile pages hasn't changed, but it will use the social image if provided for the game.