Congrats on the game!
You did a good job integrating the themes! I like the menu and the sucking animations. I will agree with other people that some music and SFX would elevate the experience much more, but the lack of it doesn't really take from the experience.
Overall, it's a cute, fun game, especially if you accomplished it in just a couple of days.
If I could make a suggestion, for no reason other than I think it might look cute, you could let the creatures roam together.