This is pretty good, I won against myself several times ;-) As others have said some additional hint to time it properly would be a good addition.

Oooh! I like this approach to the challenge! I wish there's some indicator like moving lines in the background to help us estimate the distance between blocks. And I wish there's  a one-player mode, for people like me who don't have anyone to play with haha. (I love games of this type like SM Town and Stepmania)

Also amazed at how you managed to add menus, options, and modes!

Very good concept and it is very addicting once you get the hang of it. Music is awesome. It would be cool if there was an AI you could play against but I know that would be kinda hard to make. 

Otherwise a very very good game!