And if you've used Windows before, you'll find that Patina not only offers the simplicity you like about Microsoft Paint, but also has some great additional features, including:

Continuous shape rotation - objects can be rotated at any angle instead of being limited to specific degrees of rotation
Easy tool width adjustment - use the slider to adjust the thickness of shape strokes as well as text font size
Intuitive color management - user-configurable favorite colors are prominently displayed and easily selected or edited
Transparent image saving - allows you to create an image that has no background color
Independently moveable crop frame - easily move and resize crop frame without affecting the image
Alpha blending of colors - blend a translucent color with the canvas color to create a new color
Anti-aliasing control - turn on and off smooth edges at any time

Compatibility: macOS 10.10 or later 64-bit
Mac App Store: https://geo.itunes.apple.com/app/id942568098