I'm looking forward to playing your game, alkis21. It sounds cool! I wanted to make a game like this originally, as those single screen 2-player platformers are some of my favourites. My idea was that you play as one of Santa's elves (probably a girl and a boy elf to choose from). Some nasty characters have broken into Santa's workshop to steal all the toys, so it's up to you to bash their butts and collect all the toys back. You'd start off in the workshop, and make your way out into the snow, then eventually to the baddy's lair where you stop the boss from ruining Christmas once and for all.
I'm not going to do that one now though, I've decided to work on something a little different, but your mission is still to save Christmas.