Not being able to sell at map 2 means you hve lads of raners slowly being killed off accumulating masses of sellable goods which you can do nothing with, but you do need to have them to get the all illusive leather grips... why no shop-market?
after lvl 5 or so you only really use the best 2 towers (pyramid and lava, and ok maybe slow). makes the other towers kinda pointless unless they get some special for maxing out lvl?
Nice game but a few thoughts would make it significantly better,
Ok i agree about group settings being a good idea, also having a ranking system or ratio percent, whatever on the quests so you have some idea, yes from the exp you can have a mildly educated guesse, but since you cant tell which quests which students failed itsa bit annoying. Thats the other obviouse thing, the quest feedback information should include the students which when on which quest. Nice game though.
 "Idle Vikings RPG"){kind=icon}
 "Questopia"){kind=icon}
 "Ancient Planet"){kind=icon}
 "King's Towers"){kind=icon}
 "Valthirian Arc 2"){kind=icon}