Thank you for checking out the game in such early state of development.
I am currently re-balancing the timer to make it easier for new players to familiarize themselves with the game.
The bonus buffer time you can get from opening doors, collecting coins, and jumping on top of crates. Collecting everything as you go is not ideal, because you don't want to end up backtracking through empty rooms.
In future I am going to have different varieties of pick ups, some giving gold, others time, and mana. Character upgrades are also going to increase the time, buffer, and so on, but that is yet to be implemented.
Thanks again, I hope you're going to come back to the game when new version builds are released.