Cool idea. Plays a bit janky on my computer, as all Unity games do (if they aren't already actively trying to overheat my computer and blow it up), so I couldn't get a very good score. I have to be that guy and say that the sound of (musical) whistling really irritates me so be aware that it's something some people would prefer to be able to switch off. I also realised the scroll wheel was selecting things that weren't there, and then I got a fifth tentacle in one game but it sill didn't help (how many can you get?) and most of the time nothing was selected, so I switched to the right click in the game after that. It still felt a bit cumbersome though but I was able to play a bit better.
The water effect is really great.
Question, though: you might be the beast but are you the monster? If some aggressive whistling boats came into my sea house I'd also slap 'em.