It's a fun little game, though it lacks a bit of direction.
I didn't realize at first that you could teleport using the 'T' key; I thought I had to interact with the door, since the game tells you early on that you interact using 'Enter'. As for the interaction key, I would have gone with 'E' or 'F', as those are the standard keys found in most video games. The boss fight was cool! However, I only discovered later that you can spam-jump to dodge attacks more easily; a quick tutorial involving some basic enemies would have been nice! The story is funny and charming! The music is good, too, and the environment and art style are great.
Regarding combat, I would have added more audio and visual feedback—things like impact effects, camera shake, or "hit stop" combined with a flashing effect (rather than just making the character transparent, even though that does let the player know he is invincible while transparent) for critical hits or when getting killed by the boss; this would add a sense of power and intensity to the game.
With those additions, I think you'd have an excellent game. You already have a solid foundation and a story that is funny and engaging right from the start, with a clear objective established immediately.
Great job developing all of this on your own ! :D