I finished all levels and got 3 bonus unlocked messages. Unfortunately I closed the game hoping to see them later and now they're gone. I still have all levels completed, but no unlocks.
Funny game, but it's annoying that you have to fight them without moving, or else more enemies will spawn.
I usually run out of enemies at 1/3rd of the map's length because I tend to move while fighting them. Like hit, I don't like my position, kick, retreat, and hit again.