When I click (touch) on one of these I get the selection bar to modify the color right away. It causes me to not see 50% of my screen, but in order to get rid of it I gotta click on the background behind it therefore "painting". I feel like touch-wise the UI could use some improvements. Though it could've been worse, too.

Thanks for following up on this. Yeah... we know we have to improve this one way or another. Truth be told, Mandalagaba is more convenient on a tablet with a stylus or on a desktop but I agree that we have to find ways of making it more suitable for smartphones.

I don't know which percentage of visitors is from smartphone but if you communicated that it is optimized for PC/laptop/stylus I'd have used that instead