I doubt the developers of that game frequents this forum (If they did they would already be submitting it to Greenlight even without this thread). so saying please here does very little as they won't be reading it. How about you email them or their publisher instead?

(I'm guessing you assume Valve puts the games on Greenlight? They don't, it's the developers or their publishers that do. Check the "About Greenlight" FAQ. Click the tab up top besides "Discussions")