No idea what happened with that. I set the voting end date to what was stated, but I guess it never happened. I'm really sorry about that.
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Sorry for taking so long to respond, I forgot to respond when I first saw it.
Your method of upscaling is valid. As for the colors, try your best to get them as close as possible, but it's alright if you can't exactly match them.
Is your problem with submitting your game? Because to do that, you go on the jam page and click "Submit your project". You have to upload normally first, then you select it in the drop down menu when you click the button.