I got all 4 walruses, but I completed both of the next levels and for some reason I only got 1 key even though I have been replaying both of the new levels
OK Iv finally figured it out it depends on how advanced your costumes are. Like when you complete stage 3, costumes in stage 3 will have low stamina, but when you apply any amount of costumes you've acquired in stage 4 with a costume in stage 3 (like if you have 3 pieces of costume from stage 3 and 1 piece from stage 4) then your stamina will greatly increase.
So the same thing applies with stage 3, the more costume pieces you acquire in stage 3 and add t to any costume in stage 2, your stamina will increase! I hope that made sense
Anyway, how I completed stage 3 is that I would start in Stage 2 and collect as much milk from that stage as possible so that I would have a little more milk on stage 3. The way how you could continuously have not very little milk on stage 3 is to have a kitty dressed up as one of the South Park character costumes when you are able to acquire one ;)
My game just glitched: in the temple I fell in one of the ditches and the second I fell, the point of view became airial and the game just kept on going...
 "Reach the core"){kind=icon}
 "Bullet Heaven"){kind=icon}
 "Sugar, sugar 3"){kind=icon}
 "Defend your Honor!"){kind=icon}
 "StrikeForce Kitty"){kind=icon}
 "Flood Runner 4"){kind=icon}
 "Zombies Ate My Motherland"){kind=icon}
 "Bloons Super Monkey 2"){kind=icon}
 "Battalion Commander"){kind=icon}
 "Dude and Zombies"){kind=icon}
 "Monty's Moon"){kind=icon}
 "Questopia"){kind=icon}
 "Strike Force Heroes 2"){kind=icon}
 "American Racing 2"){kind=icon}
 "Ninja Slash"){kind=icon}