the big problem here is.. limited slots to put the towers, i highly suggest taking notes on other td decks to help you learn, to note, just remix them and analyze what they are coded to work, i highly suggest you this in your project, you can remix my pvz game, its a similar game to td genre
go to the logic code of the blacl cat tower in the selection and find the cod with create blueprint, then press the blueprint that was getting created and modify it to the black cat tower