I'm always a bit skeptical of community sourced content contests like this but on top of that, the prizes you're dangling to people who you're asking to write core content for your game are worth next to nothing. Top prize dev license, $8 value, and runner up a single 8-bit pack, $3 value. This is disappointing to see.
RE: Write Lore, Win Packs: Rise of the Pixels Lore Contests