This game is fun, I got to trial it prior to submission and I thought the idea was great. You both built a "Follow the Key" Puzzle (a term I got from Mark Brown's GameMaker's ToolKit's series, Boss Keys, where the player goes from one point to another grabbing a key that opens a door, which gives access to a key used on the next door.
In this playthrough, I thought I would put a bit more pressure to the game design to see what I could do, and discovered I could access cabinets through the walls, so I was trying to access cabinets in rooms I shouldn't be able to access. This also allowed me to move the cardboard boxes at the end of the hall to "block the holes", and in doing so, the alien had stopped moving. I kind of broke the game.
I thought the game played really well, the assets of the environment are well done. The cabinets, tables, and boxes look great. I think the walls just need to be thicker to prevent the player from reaching through.