On level 6 when I pressed escape to get to the editor/pause menu, my mouse would unlock, and the game would pause but the actual menu won't show up. I am on windows 10.

Sorry about that nebula - I'm encountering a brand new bug in Unity where it thinks I have made changes to a prefab and keeps setting that change no matter how many times I correct it. In this case it's setting the menu's scale to 0 on level 6.

I just uploaded a fix, if you redownload it should be sorted :)