Awesome, I will check it out tomorrow, thanks. You mention "free culture", though. I intend to ultimately sell my game when it's finished (with another free demo, just like the current pre-release demo is free). I hope that the site allows for this, even if it means I have to pay a reasonable license fee.
Viewing post in Gathering and implementing audio assets
Yes, free culture licenses allow commercial use by definition. You might have to release any modified version of those assets you've used under the same license, and/or allow people to extract them from your game for reuse even if you didn't modify them. And if that's too much to ask, you can always contact the original authors for a commercial license. Hope this helps!