Spoilers, complete guide for itch.io version
Ending 1: Do nothing and wait
Ending 3: Click the button 1 time for the nuke switch
Click the button 2 times for the Roman numeral buttons
Click the button 8 times for the screwdriver
Use the screwdriver on the loose panel
Click the button 15 times for the hammer
Ending 2: Click the button 20 times to turn off the monitor
The Roman numeral is 213121
Fliping the lever right gives the binary
Fliping the lever left gives the keypad
Ending 10: Binary is 1101
Ending 11: The 4 green buttons is top left, top right, top right, top left
The keypad is 1066 and 3748
Ending 4: The 7 by 7 grid is (if horizontal is x and vertical is y) x1y4, x3y1, x3y7, x7y2, x7y6
Ending 9: Enter 1234 in order on the number pad
Ending 6: Hit the left arrow on the clock
Ending 7: Hit the right arrow on the clock
Ending 8: Open the loose panel with the screwdriver, then hit green, red, yellow, blue in that order
Ending 5: Grab the hammer and hit the monitor