This could make a really great game if fleshed out further. I like the concept of having a platformer where you're trying to escape a building, perhaps if you do expand on this game, you could add some more tension with the level changing the longer you take. There's a lot of possibilities with the concept and theme I think you could explore further, which is always a good thing with a concept!
I think the major thing that needs improving if so is just the players jump, it feels somewhat inconsistent and lead to me dying more than I probably should have!