[official website]
[credits & legal info]
[hints]
[more hints - spoiler warning]
[official time attack rules - spoiler warning]
Operator Status isn't the easiest game around, but it's 100% skill. If a place is too hard, search the game for some easier places to practice first.
The powerup in the Nifflas Forest does the opposite of what the shift button does. First it may seem unneccecary, but it's useful for optimizing your movements.
Always consider what each place would be like if gravity was different.
If a place is too hard to get past, try to find another way around it. Perhaps you don't have the powerup required to pass the area, or perhaps you're simply trying to enter through an exit?