Progression was just a bit slow, would also be more "addicting" if there were things that were only unlocked with a via purchase with gold. Solid game loop though, I can see 12-year-old me killing a couple of hours with this.
Thanks for the structured review! :)
I'm considering making an update after the jam is over, adding resolution selection and Android support.
Your comment made me think of adding active and passive abilities, definitely would extend the session time.