this is super fun and making each mathematical function a power up is cool. There are 2 things I would like to comment about though which is about the map and the brackets.
For the map, I would've loved it if you make it so that if you have gotten the number/math function, the would look empty instead of still having a circle in the middle, it just makes re-exploring for the last few numbers easier.
As for the brackets, there seem to be a lag problem when you place them down, especially if you place it while you're in the air (I am playing on a web browser though so maybe this is what your note said but just in case I mention it here.) The game froze for me for like 5 seconds before it continues. Also, even though the brackets gets destroyed when you solve the equation with it, you still need to press down again to destroy the already destroyed brackets before you could place it again.
With that in mind, I have no other complaint and the game was thoroughly enjoyable to play.