8 in-game hours later, I'm finally done with the badge! You can easily get through majority of the game with spamming bunnies whenever you can. Only in the later levels (Palace stages) do you need to have tortoises to soak up some damage. For the stages with 5 lanes, you can speed through them by spawning 3-4 mice per lane to start. In whichever lane has the least enemies, start mass spawning mice and the row of 5 enemies. You can generally finish the level before any enemies reaches the end on the other lanes.
 "Icarus Needs"){kind=icon}
 "Protector"){kind=icon}
 "Pre-Civilization Bronze Age"){kind=icon}
 "Paladog"){kind=icon}
 "3D Logic 2: Stronghold of Sage"){kind=icon}
 "Areas"){kind=icon}
 "filler"){kind=icon}
 "Snail Bob"){kind=icon}