You can use that for your project. That particular piece is licensed under CC0 license, which means you can do pretty much whatever you want with it.

In any case, all art on OGA can be legally used in any project, as long as you follow the license requirements. I suggest you to read the FAQ section about licenses (http://opengameart.org/content/faq#q-proprietary) for a brief description of what every license means, and to read the license's page on Creative Commons website (just click on the license image on artwork page to get there) for a more precise description.