Without spoiling, is the ending sad

[⛧NecromancerBree⛧]

I'm so so tired of finishing a game feeling like doodoo I need to be happy and this game looks so good please tell me things go OKAY

[Morthgarrow]

Without giving too much away, there are two possible endings and both I'd describe as bittersweet. Things are hopeful, especially in one ending, but there are some hefty losses as well.
I think you'll be quite happy you experienced it, but it's not a story where everything gets fixed and wrapped up nicely by the end.

[leo_gear]

You could describe some other games' endings that you'd consider "happy" or which ones made you feel like doodoo.

One thing I did enjoy about the game is the elements of a father figure raising, protecting and caring for a son (without being too boring). It's a wholesome feeling with some touches of humor and cuteness, however losses will happen and one of the core themes is learning to let go and the natural cycle of life and death.

From that description, I'd say the game tries to tug at your heart strings and probably wouldn't be a fit for people looking for happy rainbows and cookies. If you want to experience cute characters that you may like and enjoy growing closer to, I'd recommend it.