Simple game which, with a few little updates, could definitely become a great minigame within a game. Maybe it’s the story of the old retired man and his dog: from when he doesn’t yet have the dog, to starting to get a relationship and loving him. And there are some routines to the day, like picking up leaves in the morning, and it’d have this minigame as a starting point.
I had fun playing with collisioning with the dog, not gonna lie, but I think it made me think that it’d be cool to have a mechanic to walk him around and lead him places, perhaps for another game. Also there was another bug: sometimes leaves spawned at places where not me nor the dog could pick them up (cool that they do spawn at random places though, so it makes each playthrough different!)
If you could touch up the sound effects (footsteps on stone on the stone, grass footsteps for the grass, a sound for picking up a leaf, a little bark when the dog picks up one…) and have an end scene (like the dog and man meeting up at the center, side by side, with their leaves, and finding out who had the most, thus finding a ‘winner’), I think this would be a great improvement and make it a bunch more immersive.
Overal though I really think it’s a great job on your first jam game, especially a 3 day jam and doing it alone?! Keep it up I’d love to see an update if you do it.