Ah, okay, you mean the car example

you can destruct level by changing there vertex only, you will find examples on the aum

the water can be animted via a shader - look on the wiki

the spray is just 15 lines of code to add

about the entering in faces -since this is an old demo, it could be made better now, with physX as an exampele

the game need no high res computers

btw: Are you Carlos Ribeiro(on facebook)?