That's a bit of a grey area. If you want to be entirely strict about the rules, premade assets are out unless they're CC. However, you are absolutely allowed to update your game afterwards with your GUI (which is gorgeous, BTW!), so nothing's stopping you from using a placeholder of the same size for the duration of the month.
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Ah, I see.
Well, that's troubling... Since this means I would have to make an entirely new UI. I really, really don't want to use some basic place holder just to update in the end and have people play with a low quality UI first. I would like to present a "finished produkt" at the end of the Jam after all...
(More work for me.. yaaay. Crunch, here I come.)
Would it be alright if the UI is similar to the one I made for the Winter VN Jam entry, to at least have consistency within the UI as well as to have less more work?