Alrighty, I figured I might as well release the final version now, seeing as I haven't touched the last two remaining bugs in three months, especially since for one I can't find the cause, and the other I know the cause but can't find a feasible solution. That, and I don't feel like spending any more time on them. Well, here it is, version 1.37! It may still have a couple things wrong, but most of the quirkiness is gone, especially now that hitting enemies from below doesn't work by conventional collision detection anymore.
Download the final version.
''If you want to point out my mistakes, don‘t think I won‘t point out EVERY SINGLE ONE of yours.''