Hit the spacebar to toggle flying or not, and use arrow keys when flying to move around. Really, the only way to move downwards when flying is to fall (stop flying, hit the spacebar again). You can also walk using left/right arrow keys. When touching doors, you can click on them. See what happens! I'm sorry that there's no walking animation! (There probably won't be one due to bugginess) Also, right now it is a little glitchy, no worries, I will fix it!
My gravity came from Python22 (with permission), so go check out his amazing projects. The scrolling is from MathMathMath's Scrolling Tutorial. Unfortunately, I do not have a crystalline banjo (TEARS). Instinct, Cato. I am going to add more, trust me! (I don't mean more Pink Panther references, but I probably will add more of those.)