I like the concept, but there's a lot of things that I think could be done better:
most of the bosses feel samey, maybe in the final day you could have added more pegs that do different things?
Like, for the ice boss, maybe the peg slows down your cursor?
Or for the eye its like red light green light?
Or for death you have to click the failure pegs?
Just some ideas.
I like that theres different types of reaction tests, but again, those that use those are samey. I also dont see the purpose of having multiple pegs to hit, when you can only hit one, and the failure pegs are pointless, as who is going to hit them?
I personally, didn't like the music, the lyrics took me out of it, thats just a me thing though.
Otherwise, a good game!