v0.3 - Getting from there to here

It's been 4 months since my last patch and I apologize if the game seemed abandoned! I had to tear everything apart to completely redo the physics so that I could roll out a huge performance boost, since that was one of the primary complaints of the game. I've added lots of additional changes too while I'm at it!

Changes:

• Quiver size is now 4 (was 6), and can only get 1 of each special arrow
• The portal now opens and closes itself on a timer
• Knights have a proper melee attack
• Wizards have a proper spell attack
• Cats are now obtained with cards (and you can get multiple)
• Added cat upgrade cards
• Decreased music volume