Thank you! Next release will have lowered difficulty. For now I can give some tips which help me with the battles: stay in line with your units and try to focus down low hp enemies first. Killing a troll gives you a new healing potion, so it may be worth it to focus the trolls.
Hey, I was looking into the source and I found some json data files. How did you create those json files? Do you have a tool for editing json data? I'm looking for one.
They were written by hand. Json is human-readable text, so they can be created and read with any text editor. To use them for your game, you need Json parser library which shouldn't be hard to find for most languages.