Update 0.2.3 - Minor Bugfixes and Level Adjustements

This update focuses on small bugfixes, balance tweaks, and a bit of extra polish.

• Fixed the build site sprite variation not being applied.
• Next round drum now plays regardless of whether the next wave button is pressed.

• Bee: carried gold reduced from 5 → 4.
• Level 3 enemies: health, attack, and gold adjusted across the board.
• Level 3 waves: now include more enemies for added challenge.
• Giant Lizard: increased health.
• Treeman: increased health.

• Added a slight vignette effect to all levels for improved atmosphere.