itch.io

You can expand the palette dialog by hovering over the right-border until the cursor changes to the adjustment icon then drag to the right to expand it. This exposes the scrollbar although when clicking the scrollbar physically, it registers as a normal click. 

That would be a really nice addition.  If I come up with any ideas I'll drop a comment here.

Really nice work! The animation is smooth as hell which is great. It feels like it should be part of Aseprite by default.