It took me quite some time before I could unlock the last door. There should be a reset button.
It was good, however either English is not your first language or you need to work on your grammar. No biggie.
Chasing little floating stars adds nothing to the game.
Good. This is adding a little, but cozy claustrophobic feeling.
Good little game, but the last puzzle (valves) didnt unlock the last door, even though I have the right combination (all lights green).