A few years ago I had created a MultiPlayer Platform Game Engine in Macromedia Flash MX. Although the multiplayer was 2 players on the same keyboard, it became a hit with all my friends, and just about everyone at school.

After I had left school people were, and still are, asking about it. So I had started a total recoded version in Delphi, with network play. But I havn't worked on it much in the last year, and I've almost abandoned it, you know how it goes...

But yeah, people still love the ol' 2d platformers, especially multiplayer platformers.


I suggest checking out Soldat, http://www.soldat.pl/. It's not quite a platformer like MegaMan, but it's multiplayer, and has awesome physics.
It's pretty advanced for this type of game, nice effects, smooth gameplay, perfect bot AI, lots of good guns, maps etc, and it's made in delphi . It's free to download and play, but you can register to unlock some of the other features, so it's not open source.

So yeah, you got all my support Will.