My most recent single credit clear of Metal Slug played at MVS difficulty. Final score was 2,492,110 points.
This was an original MVS cart played on an original AES console utilizing a Phantom1 convertor. The feed was captured via S-Video to DVR. The joystick used does not feature auto-fire.
At present, Kiken Enryu has 2,132 views spread across 3 videos for Metal Slug, with his channel currently having around hours worth of content for Metal Slug. This is 2.13% of the total watchable video on Kiken Enryu's YouTube channel.