This game has a very cute, very sweet premise. Though, I think you should definitely try to find an artist! The assets are varying sizes and resolutions (bunch of mixels) and it can be really distracting. I think you’ve got a really solid core game here, and it could be fleshed out just a bit more, I think it could be a strong contender. :)
The gameplay was also a bit linear - totally understandable for a jam, but I think this game could be very strong as a standalone if you were to flesh out the world a bit, give the player some agency to explore and find these. If you were to make the puzzles a bit more difficult and expand on this, I really think you have a solid foundation to pursue further.
This really reminds me of a series called “To the Moon” - highly recommend if you haven’t been inspired by this already!
I did get a cute little cutscene at the end with grandpa, so maybe it works, I will definitely check it out at the end!