There are 21 beacons around the level that you need to collect. None are behind the time locked door, nor are any of them in weird out of bounds regions.

• No beacons are behind the secret door
  
• You may die while collecting all the beacons
  
• Once collected through a playthrough, you do not need to recollect previous ones after dying

I could sit here and explain in text where each beacon is, or you can watch this video walkthrough.
https://youtu.be/vw4x8DG8zBw

At the end of the level is a door that you only have roughly 1 minute to get to. Once that time is up, its closed and cannot be reopened. You have to get through the door before it closes.

The door has a timer above it that counts down in realtime.

• You cannot collect any checkpoints on the way. You must get
  
• If you die, the countdown resets
  
• Combo together rolling and jumping for the best speed. Regular walking will destroy your momentum
  
• Dont bother with collectables, enemies or boxes, just focus only on getting to the door
  
• There are no enemies, boxes or beacons behind the door.

This can be tricky, but there are several time saving shortcuts you can take, Can you find them all?
https://youtu.be/iMZI5YeHuTs

This is pretty straight forward and doesnt require much of a explanation. one of the game achivements is to get all the beacons, robot kills and boxes destroyed.

• Checkpoints are OK
  
• Dying and restoring at a checkpoint will respawn all previously destroyed boxes and enemies, this is OK. You dont have to redo those items.
  
• All enemies, beacons, and boxes are before the secret door, none are behind it.
  
• Enemies can be killed by rolling into them, spin attacking them or jumping on them.
  
• Best strategy for the shooty bots is to jump on them, or roll attack them from above.