In case you need some ideas for more cats to add then here are some cats that seem kind of fair. (I don't know what cost to put on them so you can figure out the fair price for each cat lol) Here are the cats:
Double Trouble Cat
Dice:
1, 2 with double, 3, 4, 5, 6
Slots: 2
Effect: If the dice below is a 2, then give x2 multi per pair in hand
Sextuplet
Dice:
1, 2, 3, 4, 5, 6 with mark
Slots: 2
Effect: If hand contains 6 of a kind, x10 multi
Rocket Cat
Dice:
1, 2, 3, 4, 5 with boost, 6 with boost
Slots: 4
Effect: None
Rich Cat
Dice:
1, 2, 3, 4, 5, 6 with a cantrip on a dollar
Slots: 2
Effect: x2 mult if you have at least $10
Interest Cat
Dice:
1, 2, 3, 4, 5, 6 with dollar and same-same
Slots: 2
Effect: Earn double interest
Reroll Cat
Dice:
1, 2, 3, 4, 5 with reroll, 6 with reroll
Slots: 2
Effect: Multiplies multi by the amount of rerolls remaining
Unique Cat
Dice:
1, 2, 3, 4, 5, 6
Slots: 3
Effect: x3 multi if hand contains "DISTINCT"
Retrigger Cat
Dice:
1 with same-same, 2 with same-same, 3 with same-same, 4, 5, 6
Slots: 2
Effect: +2 multi when a dice is scored
Round Cat
Dice:
1, 1, 2, 2, 3, 3
Slots: 2
Effect: Multiply multi by the round number
Lucky Seven Cat
Dice:
7, 7, 7, 7, 7, 7 with mark
Slots: 2
Effect: Multiply multi by the amount of sevens in hand plus one
Times Four Cat
Dice:
1, 2, 3, 4 with two doubles, 5, 6
Slots: 3
Effect: None
Cloning Cat
Dice:
1, 2, 3, 4, 5, 6
Slots: 2
Effect: x1 multi
permanently gains +x0.5 multi on 5 of a kind
permanently gains +x1 multi on 6 of a kind
Debt Cat
Dice:
1, 2, 3, 4, 5, 6
Slots: 3
Effect: Allows debt up to -$10, but gives -$1 in payout of money is less than $0
Gamer Cat
Dice:
1, 2, 3, 4, 5 with addition, 6 with mark
Slots: 2
Effect: +1 play, -1 reroll
Cat of Twos
Dice:
2, 2, 2, 2, 2, 2 with double
Slots: 2
Effect: Gives x2 multi if hand has at least two 2's
Fragile Cat
Dice:
1 with double, 2 with double, 3 with double, 4 with double, 5 with double, 6 with double
Slots: 4
Effect: Loses double after scoring
That's all. If you need to modify these cats to make them a little more fair, then be welcome to. Just be sure to credit me for these ideas if you add these.