Endings

Normal Ending
Go through the black corridor and press the rusty button by the stairs leading to the "Dressing room". Then step on the morph thats furthest to the right. Then step on the red button behind the board of rules and grab the key in the painting that used to have a dog and a glass frame protecting it. Then go into the secret corridor and press the green button to kill all the experiments in the room and go out the garage port. Press fight to kill the experiment outside and drive away.

Spazm Takedown
Get to the dressing room and then find a button hidden on the same wall as the dog painting in the room. Once you find it, press it and the painting should turn into a picture of Spazm. Then, go behind the board of rules and press the red button to grab the key. Use the key on the painting and it should reveal a button behind it. Press it and then go press on the furthest right morph plate to unlock the secret corridor. Unlock the door and look behind one of the experiments for a hammer. Then make your way back to spawn and use the hammer on one of the windows. Spazm's chamber will reveal full with smoke and he will be staring at you with red eyes, and that is it for the spazm ending.

The real ending
Directly at spawn, go behind the board and press the picture of a dog that's behind it. Go through the black corridor and look behind the ghost that's to the right, he will have a yellow key behind him. Then keep moving forward to the dressing room. Press on the morph to the right, take the screwdriver thats behind the morph, get the key and use it on the painting. Then go through the secret corridor, and take the hammer behind one of the experiments in the extermination room. A door in the room should be open that you'll go through to get to a "Birthday party" with 3 presents. Pick the one to the right, otherwise you'll have to start over. The present will reveal a button that opens the plank barricade, behind it there is a cake. Take the cake piece and go all the way back to spawn and use it on the dog painting to reveal a red key behind it. Then, open spazm's chamber with the hammer and take the green key in the chamber, but do not go behind spazm. Now you should have all 3 keys, go back to the cake place and the door will be open, leading to a ventilation area. Unscrew the vent and move straight forward and push through the loose vent. Now you'll be at the core reactor. Put the keys in the order, green, yellow, red and then go over to the dashboard and explode the core. Run outside when the gate opens and you have successfully gotten the real ending.

False escape 1 and 2
Go through the black corridor and unlock the secret corridor, get the key and press the hidden button on the wall. Go get the hammer and go into spazm's chamber, he won't be able to attack you if you go behind him. Then you can pick if you want to fight him or spare him, it doesn't really matter what you pick because you get the same results, just that if you fight him you burn the chamber down and get to listen to dramatic music whilst if you spare him you get to listen to some wide putin music. But both endings lead you to getting captured anyways.