The game is really difficult, never found a way to gain some HP, also what makes the game difficult is that the ennemies can shoot us even when we can't see them and with a fire rate much more higher than us. The map is really huge that's great and if you explore you'll find some buildings where you can enter. But because you die quickly you can't explore a lot. the more positive point is the exploration in this game everything is huge !! Congrats !