Snake Rattle n Roll is kind of tough, but it's made by Rare, so that's not too unexpected. I have a hard time getting too far in the game, mostly because I never really played it all that much.
So I like to skip ahead a few levels to make it look like I'm better at the game.
What you have to do is to immediately start going to to the right as fast as you can when the game starts.
Go fast enough (i.e. don't hit anything) and you'll see a rocket.
Jump up and hit the rocket to take a shortcut to Level 8!
Where the game ramps up in difficulty significantly, so good luck!
You'll need it!