I also enjoy this game a lot..but am colorblind..the icons on the tiles help, if you had a similar icon next to the enemy indicating the matching color that would be very helpful..and perhaps if the matching keys were a little different in shape or size
 "Thrones of Fantasy"){kind=icon}
 "Dangerous adventure"){kind=icon}
 "Dream Car Racing"){kind=icon}
 "Utopian Mining"){kind=icon}
 "Effing Worms 2"){kind=icon}
 "Sands of the Coliseum"){kind=icon}