Update v0.2

This update addresses feedback to the first public release of this work-in-progress game. The major issues to address were the lack of a tutorial, confusing UI, and performance issues. These items should be much improved and tons of new content has been added to the game!

Major changes:

1. Tutorial added (5 mini levels to explain the core mechanics of the game)
2. Performance improvements (lag/stuttering should be eliminated)
3. QoL improvements (can set game speed and zoom level, undo button for purchases/learning skills)
4. Improved graphics and colors
5. Unit animations
6. New visual effects
   
7. New units (including shroomling, phase knight, and goblin bomber, fairy, and wisp)
8. New skills (including the Illusion skill tree)
9. New items
10. New map objects
11. Balancing (especially changes to the damage and damage reduction formulas)
12. Bug fixes