A visual masterpiece. The cut-scenes, sprites and scenery are all really, really well done. The atmosphere is also well established, with the help of the eerie soundtrack and cut scenes in the beginning as well.
After reading the description for controls, I managed to properly control the suit on my second try, the movement feels a bit too slow and sluggish, rotation is also way too slow for me to shine light on the sea monster, but I managed to get on the third level, but I got drowned by the creature thrice.
Overall good concept, great artwork, gameplay needs a bit of work, especially the pacing. Well done!