According to a report on the spanish list HispaMSX and a post on the site MSX Resource Center, this pistol game is being developed for MSX and should be released in the next days!
The Post also mentions other games being done(by the same people who is making Super Puzzle Fighter), they are: “Final Lap”, a racing game based on BadLands or Super Sprint, and Dr.Mario, an well known game.
Stay tuned for more news about those games!