Basically, I wanted to see how others felt about this, as I'm unsure of what to do. I think what happened is that I may have run into a bug with the engine I'm using (Godot) some time earlier today, and I have no idea how to fix it, so attempting to fix it may take longer than the amount of time I have. (If I can fix it in the first place) Should I just submit it as is and warn people that there's a glaring issue with it, or submit it late in hopes I can figure out what's wrong and fix it?

just submit it and warn people and then you try to fix and update your game :) 

dont worry my games have bug too somany :(

Either is fine, it's up to you. Since you can submit late it's not that big of a deal.