Very nice entry all around and a pretty original take on the theme.
I really like what you did with the different districts and how they're used both to farm coins and to advance the main plot. The lockpicking system seems like it would be a bit lacking at first but you've done a great job expending on it. Love how you've incentivized the usage of avanced picks.
Your dialogues are funny and do a lot for the tone of the game. You've also used your palette to great effects with them but they're having some word wrapping problems (I know the pain though, the same is true with my entry).
I love the procedural generation but the level themselves feels barren which in turn also makes the game too easy. I feel like having people inhabiting the levels alongside the guards would do a lot to make them both harder and more fun to navigate.
Finally, your spritework is neat but I especially adore what you've done with lighting and with the transition when entering and exiting houses. Your main character is a bit unevocative, but maybe that come with the bagage of being an old thief.
I love you base concept, solid entry. I only wish you had the time to polish it a bit.