This isn't a religious topic, other than the fact that I shouted, "THANK YOU GOD!" upon discovering this.
Abobo's Big Adventure.
Sweet mercy this is an incredible game. You control Abobo, who is the iconic boss from the Double Dragon series, and embark on a journey to save his son. The first stage is the first stage from Double Dragon, only you control Abobo and fight a wide variety of NES characters, including Goombas, Donkey Kong, and thugs from Kung Fu. From then, it gets nutty: one level has you swimming through level 2-1 of Super Mario Bros. while eating enemies a la Yoshi, while another puts you in a Zelda-style game.
It truly is a letter of love to any NES fan, and I had such a blast playing this last night. Parental guidance suggested: it does contain some gross humor and gratuitous violence (eating mermaids can be gruesome), so exercise caution when playing this in front of your children.
Abobo. You are cherished.