Could be better
The game itself works well and is made pretty decently. However, your instructions were really vague, and in the game even less present. Leaving the player to figure out your rules beyond that you need to match two of a kind makes for initial confusion that is best left elsewhere. you need to state that matches can only be made between to icons with an open path, and that that path can only have two corners. And, as a little aid, why not show the path the game is determining when a match is hovered over, rather than just when the match is made? It would be a visual reinforcement of the game's rules - a game that, I repeat, works fine and good. You just need to make what to do a bit mroe apparent. : )