Well, as you said before, the idea of a full platform game with such low bugdet, is hard to get. Even today, sequels of MegaMan at retro-style are valued for thousands of dollars in development.
Now, knowing the limitant on the budget, I know I can make some basic games platform with the requieriments you ask, with a couple of levels for the game. Just one thing wasn't really clear; will you provide the graphics for the game?
Having said that, I work with HTML5 canvas instead of Flash, which is a modern technology embeded on all modern browsers, but works mostly the same as Flash.
If you are interested on working with me, please feel free to get in touch. I'll work on giving you the best possible game for the right price. The MMORPG sounds interesting as well, but besides it being more expensive, it also would take much longer to be done.