Post-jam updates

I finally had some time after the jam to go back and fix some bugs - no major feature updates in this one, I may yet return to the prototype to put some more substantial changes in  place. 

That being said, here's what changed:

• Player now triggers a game over when flying too far off the screen to the left
• Flies destroyed by the sensor no longer destroy the player - this is what caused those "random" deaths halfway through the game
• UI scaling implemented, which should make the game look more presentable at different resolutions.