Hi I'm a unity game developer and reskin artist. I've created over 300+ games of all types. As per your selection of endless runner game. I can do a multiplayer endless runner game for you with 7 characters, Facebook login, Leaderboard and Great graphics. Msg me to discuss ahead thanks :)
Below is list of games that I've worked on like multiplayer board games, FPS, RACING, SIMULATION, MATCH 3, ENDLESS RUN AND many more, can provide you to publish with new graphics and ads integrated. Also I can integrate Leaderboards, Ads, in app purchases. I've s vast range of game templates around 100-200 list of games.