sorry, but there isn't a way to get back to the demo on Steam once the game is purchased, but you can still play the web version here on Itch whenever you want!
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The important part of making pixel art looking good in game is having a compatible resolution with the art created. Look into the resolutions of popular pixel art games and how they are able to make it HD to better understand.
I may be interested, and meet all of your expectations. I'm in my early 20's and from the States. I also have a decent amount of experience in pixel art, writing, game design, and graphic design. Due to the 'Rona I'm also free for the foreseeable future, so I should be able to dedicate quite a bit of time for the jam. If interested, feel free to reply back!