v0.18.39 Updata - New Character Reveal!!

Update content

• During the Fever period, you can use the button to upgrade.
• Adjust the difficulty to change the enemy's rhythm.
• Correct the error when selecting the difficulty with the joystick.
• Adjust the lightning strike effect.
• Now, only small aircraft will be blasted away.
•  Fix some errors.
• The studio cat "Ramen" kept meowing non-stop, so I fed it some meat paste.

New Character Reveal!!