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Impressions after completing the first scenario:
1. I think the experience level caps could be raised. All four heroes who can advance to the next scenario reach level 6 very quickly.
2. Level-up boosters (trees) are unnecessary and useless, as is the "Temple of Knowledge" (or whatever it's called) - no hero can use it because they "lack the knowledge."
3. Releasing a hero from prison could be made mandatory, for added interest.
In principle, that's all. Let's see what the second scenario is like.
Yes, in my game, 4 heroes with level 6 successfully advanced to the second scenario without any errors.