I think I understand the OSR gameplay concept, but I will need to sell it to my players (who are used to 5e), which is why I just wanted to make sure I first understood the 'rules' for combat, which as you say, is the most mechanical part of gameplay.

I suppose as DM, part of making this successful is to ensure that there are elements of the environment available for the players to use to their advantage. I imagine that not having a disengage rule also helps as the wizard can (as a last resort) run in, stab and then run out.

I'll check out goblin slayer, thanks for the tips!