17-20 depending on the colors. A lot of them were immediate but the dark blue/purples were difficult.

Was it just me or were all of them lighter? Were there any where the color was darker than the rest?

Just curious if that makes it more/less difficult or has any effect.

Squinting did help occasionally. As well as going with your gut usually. Fun way to spend a few minutes.

Edit: Sadly I couldn't score less than 1 since clicking the wrong color doesn't start it.