I liked the music and sounds effects, they gave me a mix of calming + curious vibes.
It would be fun to draw your own creature. While allowing the player to drawer their own monster would definitely be a larger feat, a thought I had was to allow the player to draw certain body parts e.g. an opened mouth and a closed mouth and animate between them when the monster eats.
The game is simple but what it does, it does it well - good job!
Check my game out if you get a chance! https://itch.io/jam/game-off-2018/rate/338739