Early access (v0.8.2)

Thanks to GPHOBIA for finding a few bugs and posting a nice gameplay video.

This update is intended mainly to fix an issue where on certain computers the spike enemies in the last level would kill the player on spawn. There also appears to be an issue involving frame-rate and process suspension. It is difficult to test this since the issue occurs differently on various computers, but I hope I fixed this by setting a target frame-rate. There were also some other minor improvements.