I'm good programmer but not a art guy btw I use unity engine as my engine 

Can I help?

My portfolio: https://www.deviantart.com/jacownsit/gallery

Opengameart has a lot of excellent art that works great for game jams.  Some doesn't even need attribution, but it's nice to do anyway :)

If you like the style of art you see on my page, you can send me what kind of sprites you may need