Yeah, partway through development my headphones stopped working so I wasn't able to record a phone guy to act as a tutorial, I'm sorry about that. (I might just add a tutorial on the menu in an update until I'm able to add a phone guy)
The point is to survive until 6 AM for five nights, the animatronics getting more aggressive each night.
Did you see the arrows at the bottom of the screen? if you put your mouse over it, it'll activate the cameras so that you can check on the animatronics.
Putting your mouse over it again will deactivate the cameras so you can check the doors.
You did the right thing closing the door, you just need to keep it closed until they can leave, you'll know they've left if you see them in the cameras again. Once you do, you can open the door again, keeping the door closed drains power, same with using the cameras. if your power hits 0, the lights will go out and you won't be able to use the doors or cameras, from there you either hope it hits 6 AM, or you get jumpscared.
I'm glad you liked the jumpscare!
Milo and Ami appear on your Right, while Elle appears on your left.
When Ami leaves your door, she'll just go back to the right hall, so keep an eye on her.
Lila is a special case, she doesn't like the cameras, so she won't move with them up. while they're down she'll get a chance to move.
She has 4 phases before she tries to attack you. You'll know what phase she's on by the number of stars at Moon Grove.
If she's not there, and you check the left hall, she'll come running at you.
Close the door before she gets there or she'll jumpscare you, so be quick!(There's also a secret character that acts like Lila but runs down the right hall)
Hope this helps! Please note you don't have to beat all five nights, you can stop at any night past night 1 and your progress will be saved :)