I’m using gimp at the moment but it requires quite a bit of fiddling to get everything as you’d need it for pixel art. For ‘Super Brain Eat 3’, however, I used a mac program called pixen which is really very good. It’s animation tools are handy for making things like the jelly-monsters.
TACS Games 
i have to ask but what tool do you use to make this kind of graphics , is it gimp or pixel canvas? something similar?
I’m using gimp at the moment but it requires quite a bit of fiddling to get everything as you’d need it for pixel art. For ‘Super Brain Eat 3’, however, I used a mac program called pixen which is really very good. It’s animation tools are handy for making things like the jelly-monsters.