Nice score, glad you enjoy the game!
Thanks for the feedback, I agree the teleporting doesn't make a lot of realistic sense - I actually came up with the theme after I'd already come up with the core gameplay so it was sort of a separate consideration. Little hint regarding the teleport, it actually slows down the enemies and the enemy spawn rate temporarily. It's not explicitly mentioned in the game which makes it a little hidden, but it's hopefully the sort of thing a player would learn over time.
Will certainly look into a parallax as I haven't implemented one before - thanks for the suggestion.