I remember loving this game. To The Moon had an interesting story structure, and it gets emotional very quickly. The fact that the protagonists are doing these things all the time is interesting too. I reviewed this game a while ago. (My Review.)
Since you love this game, I recommend Rakuen. It has a similar (stronger even) emotional impact, and I'd like to play both again in the future.
Have a !PIZZA with !LUV
RE: To The Moon Review | A layered story with the perfect formula to make you cry // Una historia por capas con la fórmula perfecta para hacerte llorar [Eng / Esp]