Mario Crossover - Pseudo Retro
Super Mario Bros. Crossover is a remake of the original Mario game on the NES with the ability to select a number of popular characters from other NES games, such as Contra and Mega Man.
It's a lot of fun and the characters are very well reproduced, at least as far as I can tell.
It's free and plays in the browser, here's a link to it:
http://www.explodingrabbit.com/games/super-mario-bros-crossover
Pseudo Retro is a series of let's play videos about modern games that have a retro feel about them, whether graphically or in their playing style.
Intro music is from the classic cracktro by Nemesis (and also apparently the game Heimdall):
http://www.youtube.com/watch?v=CLp3reTtUk4
Categorised lists of all my videos can be found on my site:
http://www.tinyurl.com/jimplays