Ugh, I'd rather play "Yaris" again than Republic Heroes. It's a terrible game that masks serious game play and design flaws behind no-consequence deaths. It's almost like at some point the developers at Krome decided to not fix any bugs figuring people would forgive them if there wasn't a consequence. It is one of the only games I have ever felt to be truly pointless. Stay away from this game at all costs.
Dark Void on the other hand, I found to be pretty enjoyable. I don't know if $13 is the best price (didn't Amazon have it cheaper a few weeks ago?)... but the game has some good art direction, and the gameplay really isn't all that bad.