It's very charming, and the presentation is very good. I really like the music. Overall, it gave me fond nostalgic memories of old Flash games. I do have to say that some parts of the presentation are better than others, the dragon is a little odd imo.
I wish the game had a fail state, however. I understand it's supposed to be a more chill experience, but the concept is really solid with the strategising around upgrades and a fail state would've been really cool. Makes me wonder what a Recettear style game like this would look like ;