Alpha build

Changes for this week.

• Rocket jump mechanic tweaks(the explosion only affects vertical momentum to make it easier)
• Penguin walking animations
• Large "zoo" world as the main level, not just platforms and empty space

One of the big motivations behind the world changes and rocket jump tweaks were to make the game easier and more fitting to the theme. A big issue is that the levels were too difficult to begin with, so making a more forgiving world helps with that. 

Our next changes planned are to build up the lore/story and expanding the world's content.