- Smoother difficulty balance between waves.

- Items are easier to pick up (reduced odds of them exploding at spawn time).
- Reviewed item spawning balance across waves.
- Reviewed and adjusted some item prices/availability in the shop.
- Added key bindings for keyboard to enhance touchpad compatibility. Use (A & D) or (arrow keys) + (space) to swap.
- Reviewed and improved some FX (rocket trails, railgun ...)
- Added an alarm sound for when enemies deploy nuclear weapons.
- Fixed window mode settings not being saved.
- Fixed resolution settings not being saved.
- Fixed issue where city destruction was not visible.
- Fixed text overflow issues where some text did not fit on the screen.
- Fixed the bombing lighting effect not displaying in the menu background when the game loses focus.

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