Not intentionally at least. It's possible that the physics collisions and stuff behave differently on non-default speeds. Whatever the case, the game is designed around 100% speed, any and all other speed settings are considered unsupported, as amusing as they may be at times.
 "Mutilate-a-Doll 2"){kind=icon}
 "My Friend Pedro"){kind=icon}
 "ShellShock Live 2"){kind=icon}
 "Block Miner"){kind=icon}
 "Red Crucible 2"){kind=icon}
 "Transformice"){kind=icon}
 "CS Portable"){kind=icon}
 "Hexagon"){kind=icon}
Not intentionally at least. It's possible that the physics collisions and stuff behave differently on non-default speeds. Whatever the case, the game is designed around 100% speed, any and all other speed settings are considered unsupported, as amusing as they may be at times.