Pet rock as a Tamagotchi is a fun way to take the theme — I smiled when I saw it. The pixel art looks good too.
If I'm honest, I kept wanting the rock to feel a bit more like a rock, since that's the part that makes it different from other pet games. But it was nice to take care of it.
Nice work! I'm in this jam too, would love to hear what you think of mine if you get a chance.