Nice!
It's a very nice game that brings us back to the good old times.. No it should be a clicking game, if it was, it would not be alike the real metal slug..
It's not all that hard, you just need to get accustomed to each level..
I kept always dying on the second level, and when I got to the second boss and died to him I was disappointed thinking it was hard and that there would be more levles and would be impossible to win.. But no! I got to the boss again and killed him, there are only two levels!
Great game. :)