You're not the first to propose something like that. Infact many people (so many it's not even funny) have tried that, only to give up because its too tedious: it takes a lot of time, talent and especially patience to make a game good.

I know everyone would like to make a Jazz Jackrabbit game, or even a spin-off. I'm currently planning a spin-off myself, based on Sonic CD, but I'm lacking tools to do anything else. Trust me: making everything work story-wise is hard

- JelZe GoldRabbit =:3