A recent All Clear run from the Saturn version of Metal Slug (using the 1 Meg RAM expansion cart) played at Arcade Difficulty (MVS).
The Saturn port is based off the Neo CD version of the game (which is missing some random background elements from stages 2 and 3 in comparison to the cart). The Saturn version has much faster loading times, adds an additional sub-category to the Gallery (which is in 480i), and adds voice to Sophia (the Combat School instructor).
At present, Kiken Enryu has 2,132 views spread across 3 videos for Metal Slug, with his channel currently having around 2 hours worth of content for Metal Slug. This is 2.05% of the total watchable video on Kiken Enryu's YouTube channel.