Hi I'm new here, not sure about the correct system of bug reporting yet, but I did notice in one map - the one on the docks with 3 ships, there is a small concrete jetty on the opposite side of the map near the most distant boat, which looks like you should be able to walk over it to get to the tower on the end... but you can't get onto it. Also, there was an alien in that tower.
After searching all the boats and everything, thinking maybe the jetty was a no go area - or maybe thinking the map was broken and wasn't letting me win, I spotted the alien and managed to snipe it, but there was no way I could walk over that pier.
edit --I just found the bugs section of the forum - sorry mod's can someone shift this please?