Day 12:
Sorry for the long wait, but I am happy to announce that over these past few days, I have done literally nothing I have worked as hard as I could to get the game to a playable state! I've implemented the flier enemy, who dashes toward you through the air, which was drawn by @ButterTheTurtle: 
Also I've created the main menu of the game, some of the background is still a work in progress, but so far does it's purpose:
(Don't worry I'll change the font soon)
I've also created the main theme of the game, which I just whipped up today. It's supposed to make you feel scared, or worried, as you head into the deep dark cave. I'm not quite sure if my song has that feeling, but it works for now (you'll be able to listen to it when it comes out).
Overall, despite conflicts and a busy middle weekend, I'm proud of what I've done for this jam so far. However, as time runs out on me, I'll probably cut back some of the game's content, as I don't think I can do effects and multiple levels in 2 days. However, I will try and finish the animations (If ButterTheTurtle can finish them in time) and maybe make the shooter enemies(?). So far, it's been fun, and I hope I can put out a decent attempt at a game before the deadline!