ToT is actually better about that. You can go about restoring the rainbows at your own pace, and there's no rush to get married or anything. I got married relatively early (to Oweennn, 8D), and while my character was pregnant and everything, I started to get more stuff for the rainbows, so I didn't just have to sit there and do nothing expect wait for a baby. xD
I have the SNES game on my Virtual Console. I'm not a big fan of it, but it's still fun.