Health bar aligned with art and changes color
Merge remote-tracking branch 'upstream/master'
Merge pull request #12 from pavedwalden/master

Integrated health bar
Add basic depth limiting
Merge pull request #13 from pavedwalden/master

Add basic depth limiting
Add ocean background grid and scrolling
merged alex's code with Brad's
Merge remote-tracking branch 'upstream/master'
Enable mermaid to attract food for a certain period of time.