I've contributed to a VR project before, but this is my first full 3D game from scratch and I'm having a great time with it!
The idea is to have a toy-looking train ride through a little town and stop at stations to pick up and drop off cargo (probably represented by toy blocks or something) to earn points before time runs out. I'm thinking if I play my cards right, this will be fun for kids or adults because starting and stopping the train is easy, but there will be a little strategy involved in getting a high score.
Right now I have a train following a track which I think looks good enough to give a toy train feel. I'm about to start working on additional train cars to hold cargo and then I'll start working on stations to stop at. Then I'll need to put together a UI and do score-keeping, then I can work on audio, VFX, and making things prettier until time runs out. I think the scope is going to be just right for the timeline and if I fall a little short I should have no problem stopping with something playable. Really happy with it so far!