Hey, congrats on the game!
Some feedback: Music was monotonous and very loud (I know I can just turn down the volume, but I wanted to let you know).
The text in the tutorial was also quite hard to read. For example, to read the whole monster text, I have to get really close to it, making it chase me and not being able to read the whole thing before dying.
Most of platform games use the space button to jump, so it can be a bit confusing to use the up button to jump and space to scale. Have you tried leaving space button to jump and using up and down to scale up and down?