I may be interested, and I may also have some ideas on how to visualize (or should I say auralize?) the curves with sound.
Btw, this screenshot has two problems:
1) in math, you typically write constants on the left side. y = 2*sin(x) (sin(x)*2 is not incorrect but unconventional.)
2) The waveform drawn isn't actually sin(x) but -cos(x)Maybe I'm jumping to conclusions now, but I think the game, judging from the screenshots, will be less fun than it has the potential to be. I want to see more complex formulas, (that are gradually introduced so the noob isn't overwhelmed.) This includes things like sin(x+cos(x)) I want to see a bigger level than that. I want to see a time variable in addition to a y(x) type function. This way you can make animated platforms. Constraints on the variables: you only get access to x values and y values between certain limits, and you must now make the best possible solution to the problem. So yeah, I have ideas.
Cool to see people are really intrested in the game idea 
to quickly answer your questions:
1.) how to write the math is up to the player. So if you are a math prof you can enter 2*sin(x) if you are 12 years old and you have no clue on what is conventional in the exciting world of math, just write sin(x)*2. Both will have the same answer as a result so it's all up to the players
2.) A good spot! it is actually sin but with an offset given earlier.
I thought about making the formula's more difficult myself aswell.. the problem is, for a normal casual player sin(x+cos(x)) or time are too hard to deal with. It is already hard enough to promote this game to normal gamers with no specific intrest in math!
@TrebleChild
It's true the formula options are somewhat limited. BUT.. it's more than just 'press the buttons in order'. Because you do have freedom. For example in the above screenshot you can make :
x
2
2*x
sin(x)
sin(2)
2*sin(x)
x*sin(2)
Later levels will get more buttons... the reason I keep it simple is the same as above; I want normal gamers with no specific intrest in math to play this game as well
