This is so cool!
You did a great job creating a flying character. You defined great its abilities and limitations. I'm curious of how could this evolve with power ups. It's so fluid.
You placed everything right to give hints and teach the player how to move. Making it bigger and keeping these design features can lead into an enjoyable game.
Graphics were well implemented but I might be missing some sounds.
Thank you for taking everything I like from videogames, this is a really special gift.
Pd. Is this a Part-Time Death reference? If it is, I love it. It could be a universe where Clare took the Death's job.