Catchup is a fun game, but prototyping it would not be difficult, for the kind of person that plays games like Havannah at Little Golem. Cat Herders is similar.
I suspect that people who play lots of different abstract games have a lot of prototype components on hand—stuff like different size square and hex boards, generic abstract pieces. Hex is a classic of the genre, and yet has gone long periods without affordable commercial sets being widely available—it's easy to build. Slither is a game you play with a Go set. Catchup you would just need a printed Hex board and some glass gems.
I suspect that people who play lots of different abstract games have a lot of prototype components on hand—stuff like different size square and hex boards, generic abstract pieces. Hex is a classic of the genre, and yet has gone long periods without affordable commercial sets being widely available—it's easy to build. Slither is a game you play with a Go set. Catchup you would just need a printed Hex board and some glass gems.