Updated to squash the summer bugs

We've updated Dr. Trolley's Problem to address a whole swath of bugs that players found. With more players from the sales there were more eyes on our game, which meant more mistakes were found. Sorry about that. We're happy that people are interested in our humble game though :)

Fixes include:

• Pushing people off a bridge is less buggy
  
• Menu works even better than before
  
• Load time improvements
  
• Various fixes to the tutorial
  
• Other tiny things.
  

Hope you enjoy the game!