The game is (currently) less than $7 USD. If you cannot afford to pay that (or don't want to do so) then either wait for a sale (either here or Steam) or play something else in the meantime. There are several freeware and open-source racing games you can play in the meantime.
There are currently 18 comments on this game (including my own) and HALF of them (9 comments) are from you. Please would you kindly stop spamming the dev and demanding the game to be free. The mobile market has tons of free trash to play if you're bored.