Cute game. Here are my criticisms:
The font is just too much. How do S and Z both look like an I? But I looks like an =.
I broke the game at some point by clicking the next node on the world map, then another that I had noticed became enabled for the animation. I had clicked the next fight node, then the reward branch I hadn't picked before. I completed the fight, then ended up stuck at the reward branch on the journey map with nowhere to go.
In my opinion, economy upgrades in games like this are always boring. I also wasn't really sure what upgrading range or speed was good for most of the time. Everyone seemed fast or ranged enough.