There should be a Continue button, the game automatically saves every morning. If you choose the "Restart" button it will start over.
If that happens again, could you send me your save files so I can try to reproduce it on my side?

Here is how to find those on Windows:
- open a file explorer and type %AppData% in the adress bar
- Go back one level to AppData, then go in LocalLow
- Look for a folder named Doot, then inside one named MinamiLane
- send me everything you find there to dodoot.games@gmail.com

I think the problem is that you can only have 1 active mission. We had finished mission 1, and started mission 2. My daughter wanted to go back and visit our street from mission 1, but it had the play button. So when I clicked that it started mission 1 over, and mission 2 then had a play button instead of restart / continue buttons. She'd love to just have the streets saved as they are at the end of the mission. So, if possible, it would be great to just have continue/restart on every mission once started. Thanks for making this fun game!

Oh yes you got it right, I use one single save file for all the missions.
I will write that down for a future update but I'm not sure it will happen soon. Thanks for telling me!