I really like this game.. OUO It's simplistic and easy to pick up and play, yet very challenging to master. I don't have much to say except maybe you could try adding some bosses to get past after the player gets to a certain point in the game. The squid could probably hit the boss in its weakspots as it stands still and doesn't attack the squid, only letting it pass after he's defeated. The boss could also drop some snacks too, heh..
Sorry about all the rambling, it's just a weird idea I had.. >w< Other than the game being slightly boring due to the lack of different game elements, this game is really cool and I can't wait to see what else you do with it.. :D