if you want to see thing more jurassic after exiting from the cave try to jump the big gap and reach the platform and then contunue on that path, this is a secret shhhhh ;)
Vote To Keep Alive plz: defeat the boss is very simple, the first part (before the lazers) is simple and you must only avoid his attacks, But when he/she starts to use lazers you must stay on a platform on one of the sides, jump to avoid his slash and fall on him and be stunned. he will try to hit you but he can't if you are stunned and the rocks will fall on him giving you the black gems :)
A really talented dude named Kevin MacLeod, you can find his stuff at www.incompetech.com!