Sadly, if you didn't rescue everyone, its very possible you can't leave lol. However the ship is accessible to everyone... if you can get the key items. We had some trouble with the enemy AI... it improved a lot but it does get stuck now and again. Also, the gun doesn't kill the monster but if it reaches a certain threshold then it will retreat, though having an sfx to tell the player that is a great suggestion! As far rushing into them, yeah the low visibility was part of that... however you can hear the slime more intensely as you are closer to it.
Thanks for your feedback!