Had this idea pretty much since the game came out, and now I've started working on it because it might be a good way to kick off my game dev pathway before I finish my bigger game, Protocol 3.
The basic premise of this game takes place on the rails, where there's a break in the track while Rambley is making a delivery. You go through the forest, fighting off enemies while collecting materials to rebuild the track and upgrading your abilities to make the task easier. Obviously, this isn't canon to the original game, but it's a fun idea I had.
Anyways, here's some screenshots of what I got so far, and there'll be more to come in the not-to-distant future.