Have a look at the FAQ: http://opengameart.org/content/faq#q-proprietary
Each license has different requirements, so be careful to read up and do your research. If you're still uncertain you can ask permission directly from the artist to be safe.
This looks like a cool project. However, the submission doesn't really look like it has much in the way of game assets. The screenshot really isn't much use as-is, and the two melon guy assets are marginal in usability given the two poses and no other assets for context. Is there a particular reason that you've limited the assets to those? If your goal at the moment is just to advertise your project, that's absolutely fine, but the forum is the place to do it rather than in art submissions.
Oh, that's weird. I did a search and it looks like it got sorted into the wrong folder in my email and got buried with a billion forum notifications (gotta adjust my filters!). Thanks for that! I'll definitely check it out soon.
Thanks for letting me know! This looks like a really cool project, and it's really cool to see them used in something like this. I don't have an apple device myself, but I'll try it out on my dad's iPad as soon as I get a chance.
I really like the character design. That's a really good kind of resource that can be built off of by almost any kind of artist.
Oh dang. I'm really sorry to hear that, I'll definitely bring it up to him or Botanic when next I see them on IRC. Bart, as you might guess, has been pretty busy recently, so he must have missed your message.
I think it ended up being submitted twice somehow, and one of the submissions was subsequently deleted. Try this one: http://opengameart.org/content/weapon-asset-pack-melee-1-1
Yeah, obviously no relationship at all...
Looking at them side by side it does look more like a paintover than a direct cut 'n paste, but I have little doubt it would be considered a derivative work in a legal sense.
And this is just the first asset I did a bit of looking for because of the obviously pieced-together/mixed resolution look of the screenshots. What would a client find if they looked further?
This is an unfortunate technical issue that's been cropping up. Unfortunately it's not something I can fix, but contact Bart and he will sort it out.