This was super cute! It had it's share of collision issues, and some portrait work would have been a great add, but the city was very explorable and well mapped out. Also, you should add some comments or notes on random places (like bookshelves, draws, windows to stores ect), it's a really good way to give more personality to the characters, like you did with the sand bucket. The sand mirror was my favorite puzzle!
The story was very nice, and you had the best city. There's only one game I did not complete, but it is so cool you fit in a lock picking game when others (including myself >_<) did not fit it in. I don't remember any others with that, again I did not finish one game, so not sure if correct on that.
Overall, this is an amazing first RPG Maker game! Honestly, most of my critique was mostly ways to add to what you have already done, so it's really just advice or an idea. The only actual critique is to double, even triple check your collision. I hope you make more games, and keep having fun with it!