As people have said this is not a game. One-and-a-half stars for animation quality because it's quite good, but a lot of the different screens changed before I'd finished reading them.
And as a Physics undergrad I can tell you that while not all you say on this is wrong, the bigger statements you make such as the bit along the lines of gravity being the expansion of space is certainly incorrect. Space is expanding everywhere, and everywhere the same. This is what causes something known as 'cosmological redshift' and from our measurements of this we can estimate the age of the universe. If you want to read about the cause of gravity and the bending of space then have a look into general relativity.