I'm just getting into VV1, so may not know what I'm talking about, but here are a few suggestions:
1. It would be nice to have a definate end point to the game
Or, better yet, a new set of challanges(puzzles/levels whatever)
for when all the current techs/puzzles are complete.

2. Put in some way to see your score. If there's one in VV1, I haven't found it yet so I have no idea if I'm even remotely qualified to be on the leader board. I'm probably not, but it'd be nice to know.

3. Once a villager reaches say age 60, let them retire. At this point they could become village elders and sit on the town bench (you'd have to build one) and baby sit for mothers who could go back to work at least part time. They could also entertain the youngsters by telling stories etc.

4. Once a villager has fully mastered a skill, they could be renamed as teacher or guru and hold training sessions for the trainees. They would get equal credit for the work the trainees do.

5. Keep the games coming! I'm already highly addicted to VV1 and plan to get VV2 shortly. I eagerly anticipate getting VV3 through VV99 as they come out