There's a great monster in Amphibious, and in that regard no-one will be disappointed. The story is sound, though hardly believable, but this is a movie. The script is cliche and seemed somewhat stuttered, as if made up at the time of filming. The actors can't do much with it to add to the believability, and in a lot of instances don't even try. Pretty good casting/characterisations. I suspect a very young filmmaker was behind this, as there are a lot of edits where it's pretty obvious there had been a cut in the filming, and insufficient care was taken to ensure a smooth continuity. The soundtrack, however, was very good. The sea location set was inspired and that alone managed to drag the piece to above average. I enjoyed it. It's not overly long, and there are plenty of interesting deaths, though a lot suffered from that lack of continuity I mentioned, and only basic attention was often given to various body parts emerging after attacks. It's a pass from me.