I don't see how it's any different mechanically, as it is as far as I'm aware, pretty much exactly the same as 5e so far. I know the spells, actions, and strategies that work it's just against the encounters where they've got often 3 times the hit points there's only so far that will go.
I'm not sure what you mean by 'play it like it's DOS or DOS2', as it's neither of those games, and I can only be expected to use the game mechanics presented to me. The game should still be playable to people who've not played DOS or DnD, although there'd obviously be a steeper learning curve for those people. This could easily be solved by lowering the level of the enemies to make them more in line with the party.
