Speed indicator is more like a throttle or rpm indicator and is in my opinion, useless. Usually you loose speed and then stall. Add a airspeed indicator and a stall alarm.
I like this. I suggest adding an option to rotate blocks, change color/pattern, a toolbar to seperate the selectable blocks from the viewing area, add more selectable blocks and sizeable shapes. Basically more options with shapes and color. Some sort of perspective would be nice.
 "Aground"){kind=icon}
 "SPACEPLAN Prototype"){kind=icon}
 "Gravitation"){kind=icon}
 "Spidle Tridle"){kind=icon}
 "Zak"){kind=icon}
 "The Last Door - Chapter 3: The Four Witnesses"){kind=icon}
 "Adventures of Joe, the little shoe!"){kind=icon}
 "Space combat"){kind=icon}
 "UT-95"){kind=icon}
 "Dale & Peakot"){kind=icon}
 "The john doe's adventure"){kind=icon}
 "Ultimate Chopper"){kind=icon}
 "little escape"){kind=icon}
 "Sailing"){kind=icon}
 "The Feel Good Game 2"){kind=icon}
 "ToyRoom3D"){kind=icon}
 "Virtual building blocks 2"){kind=icon}
 "Agnus the destroyer"){kind=icon}
 "Dungeon Cleaner"){kind=icon}
 "Space Fighter"){kind=icon}