EarthDefender for

From PDArt:

Earth Defender is a 21st century version of the classic arcade game, Space Invaders. Defend the earth by shooting the invading aliens out of the sky. Gain extra points by successfully destroying the UFOs which appear in this multiple level game. If you survive long enough, you may even make it as a leader on the top 6 high score board! Features include:

• color support
• greyscale 2 and 4 bits support new
• high resolution 320x320 support new
• palmOS5 compatible
• palmOS5 enhanced new
• 48 game levels
• save / load game
• autosave game
• battery status
• clock
• top scores board
• game background
• sound level control
• fully configurable controls
• hard-key control