Paint-like graphical editor for Debian?

I'm looking for simple graphical editor for Debian to make pixel art. It has to have pixel grid, be able to draw simple shapes and right-click ideally should apply secondary color (unlike gimp, which is almost ok, but has context menu on right click and is not quite simple when it comes to drawing a rectangle). MS Paint fit the bill on Win, but there are no exact clones(?) of it for Debian 9.