After giving some thought to this card game and the feedback I've been receiving for it, I've decided to make some changes. I've decided that having cards that can only move one direction makes the game progress a bit too slowly, so I think all cards should have 2, 3, or 4 options for direction. Also my playtesters seemed overwhelmed by "remembering" what was on the card, and rather than having a game about memory my intention was to make it more about surprises. I used a couple of wild cards in my playtests, but the 'wild' part was clearly displayed on the front, and the back just had direction arrows. Now I think the wild part should be on the back, and no arrows (wild cards can either move anywhere or not move at all).
Here are examples of what some of the cards look like now:
I also want to change the functions of the wild cards. The lightening bolt cannot move, but if it is put into a set of 3 the player can collect every card that is touching the lightening bolt. The heart can be moved anywhere on the board. And the 'anti-wild' cannot move but can be a part of any set (it represents any color).
I have also had some random ideas about having cards that have a different color on the back, and once you turn them over they don't turn back. I'm not sure yet how to use this in the game, but it seems interesting.
Here is a picture from playing my game: