The concept is nice, but the build... is very very very ugly.
Also some of the names of the boulders are rather childish and will extremely offend others (naming one after a certain school for example).
It's nice to see something original as a game though (as far as I can tell anyway). Just maybe make it not so ugly looking and either don't give the boulders names, or rename them to be less offensive, as it makes your server seem rather childish.