Wow. Awesome! Do you create by pixels or paint and then pixelate it after somehow? Your work is amazing!
I use ProMotion which is very similar to Deluxe Paint of Amiga. Basically, it's like Paint packed with tools and a way more intuitive interface. All my pixel arts are hand-pixeled, that is, I avoid using tools like automatic anti-aliasing and do it pixel-by-pixel instead. Thank you :)