Thanks to the resources list by Alakajam for lettimg me know about Piskel! It's so lite and lovely that I can focus all my thoughts on making pixel arts. And its animation support - you have to give it a try if you haven't yet. And its exporting function makes it so easy for preparing game sprites.
I think I'll probably make a 2D pixel-style game in this jam. It's just nice and easy for me. For anyone who haven't viewed the resources list, just don't miss it in your preparation.
OK. I just want to show my quick work here, actually. It's my cat Nino (but I keep calling her Puppy)
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Piskel is definelty amazing.