[JoshuaDavid]

I managed to get 80% with only horizontal bars: https://imgur.com/a/OnhVdyr. I have not, however, managed to get above 85% (though I've gotten 84% a few times).

It looks like, if every pixel is colored using the closest color from the palette, the score would be 94.7%: https://imgur.com/a/wiltqay. So 90% would be quite close to the theoretical max score.

In terms of game mechanics, I love the percentage score that updates in real time. That immediate feedback is really compelling.

[Sebastian_09]

Interestingly very much looks like a Rothko !