I feel you, I have had similar issues >.<
Don't hesitate to downsize your project a bit. But if you reaaally want to put more time into your jam entry, there is always the possibility of submitting a v0.1 and adding to it after the official dates. It usually helps with polish/debug to come back after a good rest.
I think I'll end up doing that, yeah :3 Even if all the code will be done by the deadline (I fixed the game-breaking bugs, so I think it may be?) the art probably won't. I'll probably submit what we have completed, and then me and my bf may spend a couple of extra days just polishing the visuals or fixing any bugs that crop up :3