Clever idea! I liked the audio clues, and the theme is spot-on.
I felt the game could be a bit faster paced – either more stuff happening or just fewer transfers. The alien minigame was fun the first few times, but would be neat to have different icons to look for, maybe different UFOs or kinds of aliens.
I liked the creeper in the back making noise and getting slowly closer, but being unable to clear him until he got right behind you. Scary, and good pacing. Maybe a reason to keep looking forward, like not missing your stop, could also help to build some tension.