I've been nearly locked out of completing this game because of bugs on this final level, from just completely crashing out to a game-breaking walking bug. 

I'm using mouse and keyboard. No other hardware is connected such as controllers or other mice. This bug appears after a certain point of the last level of MCD.

Please forgive my frustration in the video. I'm quite frustrated about how many times I've had to restart this level due to bugs. https://youtu.be/xWeVcJhpkT0