Basically, all the sounds in the project are available under the Creative Commons Sampling Plus 1.0 license. You can creatively change a work and use the derivative work commercially or noncommercially. You could take the original and distribute it in a noncommercial way.
Sounds great to me, especially for my early projects. I’ll pay for my audio needs when I think doing so will help sell my games. For now, when I am just trying to make simple games for myself, these freely available sounds will be good enough.