I really like the vibe that the art and audio bring to the table! I particularly like the portrait in the top-left too!
I had the same issue that another user mentioned, where the game froze when I tried to open the shop at one point. I must have opened it 10-15 times already, so it's odd it happened that time!
For me, it was also after having visited the shop just moments before - but I'm not sure if that's related or not!