Minor improvements and release of v0.1.01

A new build of the demo is out!

• Got some feedback that the energy cells were too similar to enemy bullets, so I changed them to rings!  This feedback had come to me a couple of times in development.  Hope this is more distinctive!
• Updated the controls tooltip in the options menu to point the player to use arrow keys instead of WASD.  Arrow keys have always been usable for movement, but the previous tooltip referenced WASD which was uncomfortable to use with "z" as the firing button. 

Enjoy and please continue to give me feedback! 

-Joel