I downloaded the save, played it once. On day 8, the hero is level 9 with stats 8-1-6-3. I cleared all the mines except for the gem mine (not critical in the first week) and the key master's tent. I visited the arena (+2 to attack, a skill point booster +1, and an experience stone).

Exactly. On this map, with some luck (or the ability to reload), you can take all the mines except for the gem mine (which can be grabbed on the way to the center) and the key master, although in a real game, without Leto, the cyclops are a bit of a risk, but the terrain helps on this particular generation. However, I play this map with 4 heroes in the first week, although maybe 3 would be enough.
We're waiting for Vaishan's and especially Ratnik's results, as he accused us of

having arguments that boiled down to just the phrase "you're an idiot."