Keep at it. One step at a time and you'll get your game made eventually.
The characters are completely overhauled for the full version of Termina, so better not put too much emphasis on the demo. I don't think any of the game testers would call Doctor overpowered or in imbalance. There are other characters that have an advantage in the full version.
Termina takes place in F&H's equivalent of Czech Republic (the name of the country is even Bohemia which is historic name for that area) There's some russian/slavic text in the game because in the game's story the area was occupied by a country that's comparable to Soviet Union in some ways (and in some ways it's very different) until Bremen Empire got a hold of the area. It's a bit convoluted backstory, but the texts around the city area and on the map are in Czech .