Second Post Jam Update

More GUI changes and tweaks on mechanics when enemy ships destroy parts of the base.

• ✅ Added a option where the player can build walls for protection.
• ✅ Costs are reduced when buildings have been destroyed.
• ✅ Removed scanner option.
• ✅ Updated GUI with pixel fonts and icons.
• ✅ Fade effect when using the energy meter.
• ✅ Removed extra obstacles in the beginning of the level.