Very well polished (both visually and aurally)! I was able to recreate the Restart level bug - I didn't try each level, but on levels 1 and 4 it seemed to happen whenever I restarted the same level more than once, the last one being by a failed level, not by restarting a successful level (very complicated, no clue if true). The fix was to press ESC twice (enable and disable pause menu). Image below (nothing was moving and timer was missing). Other than that, I have a few more pedantic notes:
1) When I kill the last sheep, there is a delay until the win screen is shown, meaning if I touch a dog or the timer runs out during that delay I will still lose (might be intentional, idk).
2) The game's last levels could be made more difficult. For example, the last level could have a low enough time limit that the player has to use the most optimal routing
3) I didn't quite get the connection to bread/sandwiches. It seemed like random theme, as it was only referenced by the story boards and title
That all being said - still a very cool and atmospheric game! Looking forward to part 2!