Post-jam update

I went back and added a little content and some QoL updates to this.

The original game didn’t save your progress, so if you played before you’ll have to start from the beginning. However, the save format should be robust against future updates if I make changes in the future.

• New content: 10 more levels, including 1 new microbe type
• Tweaked some levels in world 3 to hopefully make the rule more understandable
• Completed puzzle progress is now saved
• Added keyboard shortcuts