I find the compass way more useful than the auto map. The shotgun seems to be the most powerful weapon you get early on, I find myself using it even in the later levels. Once you get the grenade launcher then stuff gets real fun.
I also get stuck when walking on the edges of solids, which varies from annoying to game-blocking. I like that player death means just restarting the mission with the same gear you entered with.
It certainly captures the imagination, rough edges and all. I’m quite enjoying this game!