Really fun game! I just love all games with such upgrade paths :D I played it all the way to the end.
I also really liked the general artwork/design.
Some feedback for possible future improvements:
- It would be nice to have the income effect of the minions visualized better. Only after the run when I read the description again did I notice how much money they must have gotten me. During the game I wasn't sure.
- The minions didn't seem to impact the regular gameplay except for the extra income. It seems like two parallel mechanics. Incorporating the minions into the regular gameplay more would be nice.
- The fairy was a bit underwhelming for me personally. I didn't even notice them at first, which I guess is the goal, because she should be hard to find for the money she gives, but I had hoped more for a big and hard enemy for the late game.
All in all great work, especially considering you did it solo! I really enjoyed it