I generally like it and it feels fun to interact with the building. However, I am not a too big fan of the way that you have to discover the bug in order to reach the goal.
I think this approach is creative as a solution to the game, but it is also somewhat flawed. Mostly, because you get no hint from the game that is showing you that this is what you are supposed to do in order to reach the final goal. But also, if you figure it out, you kind of only do some by accident and by hitting the trade button way too often. But, I personally do not think it is a very intuitive thing and I only learned about this core "bug" when I read the game discription after I played.
for a core mechanic, I think it is way too unintuitive to be discovered and engaged with by most of the players. and without that mechanic, you really only have a short and fun incremental game with some nice pixel art.
So overall good job for the time you had, but I think it would have been way more fun if you found a way to integrate that core bug more naturally in the game.