Really impressive for your first game! I'm sure you've learned a lot through the whole endeavor :D One piece of feedback is that the player is slow which feels bad, especially given how large the map can be. Another thing for future jams or games in general - music and sound greatly change how polished a game will feel. I think the art can be bad (just call it style), gameplay could even be boring (idle games exist), but having sound will instantly add responsiveness to feel more like a finished package.
Still though, this is much better than my first project and I hope you continue making games! Really cute dog too, hope to see the others in a game one day ;)