There's a total of 6 vehicles in the game:
1)Mr.Cuddles - The dragon vehicle
2)Gravity Suit - allows you to change the gravity from bottom of the screen to the top and vice versa
3)Stomper - the mech suit that stomps and kicks Scientists
4)The teleporter - this is a purple jar that will hold your character and when you click teleports you to the position the line was pointing to
5)The Hog - this is the bad ass motorcycle
6)The Bird - this is the vehicle shaped like a bird that when you click jumps upwards. It also has money coming out it's butt.
You can get these vehicles in 2 ways:
1) the basic way of when your playing you'll come across a block with gears on it, fly up to it and you'll be given 1 of the 6 vehicles
2) There's a gadget under sector 5 called 'Free ride' which gives you a vehicle at the beginning of play that costs 5000 coins, but will take a while to get since by the time you get enough coins to unlock sector 5 you'll more then likely have seen all the vehicles