The game Go! Go! Pogo Cat has missions that can be completed to acquire rewards in the actual Battle Cats game. These rewards are highly recommended for a top tier time, so read the document listed below for a guide on how to unlock these rewards and reuse them for your speedruns!

https://docs.google.com/document/d/1wvvkclDr66bJ8pd5Qox2DlBKus1BoBmv1OrmhhWVAsw/edit?usp=sharing