Really unique interpretation of the theme, I liked it. The wolves travelled wayyy too fast and I couldn't tell where they were coming from, but it's a fun game.
If you do keep working on it, I would suggest possibly making the wolves start spawning and progressively spawn faster as the sun sets, that would make the game tougher as it's being played, while also making sense of how wolves hunt when its dark.
The game was good overall, and I liked it!! The only problem I had was with the stubborn little sheep :(