No revenue estimate for GOG — its rating/review counts don't calibrate to sales the way Steam's do. The Steam version is estimated at $39.6K — a different platform, not this one.

Paperball

It's time to get rolling!  Navigate tricky passages, pull off crazy stunts and get ready to fall off the stage more often than you count in over 150 stages! All unique levels will test your balancing skills over the course of over 10 papercrafted environments in a variety of game modes.  Take on challenging stage sets, trying to fall as little as possible, or risk it all to score the best time on any stage. Play any way you want, alone or with a friend.    Play on over 150 stages spread over the course of 4 difficulty levels.  Roll against the clock! See how far you can get in Rush Mode before time runs out!  Try to break the record times to score medals and unlock new worlds in Medal Mode !  No lives to keep in mind! Keep trying until you master the stage.  Competitive local multiplayer . Finish first for the highest score!