After the base is hit, an Angelic Gory, a Heavenly Hippoe, a few Wall Doges, and, most importantly, 3 Hyper Mr.'s appear. Most of these enemies are spawned at a mild pace, and Hyper Mr. appear in groups of 3 every 2 minutes or so.
Strategy 1: ft Kasa Jizo
Row 1: Manic Mohawk Cat, Manic Eraser Cat, Eraser cat, Ramen Cat, Sniper the Heavy
Row 2: Kasa Jizo, Catophone, Holy Valkyrie, Cyberpunk cat, Ururun cat
First spawn a ramen cat and save up money, if one dies spawn another, after saving up enough money spawn Cyberpunk and everyone else, the more Cyberpunks you have the better they will slow the Hyper Mr.'s, basically the hard hitting area attackers to defeat the angels and kill the Hyper Mr.'s.
Notes: catophone might be able to be switched out as well as sniper the heavy, also my ramen cat was level 40+8 when I beat the level. I am not very good with strategies but I won with this loadout and I felt like I should post my winning loadout because no one decided to post any strategies yet.