Changes:
- Added 2 new levels to the "Challenges" mode.
- Added the ability to select all units of the same type with a double-click.
- Added the ability to choose the formation direction of units during movement.
- Added the option to sell your buildings.
- Reworked the "Orbital strike" ability: damage now depends on the speed of the magnifying glass.
- Fixed a bug related to unit upgrades.
- Fixed other minor bugs.