That's a great game. A true love letter to Contra and Metal Slug, but with its own character instead of feeling like a copycat. Graphics, soundtrack, controls are all superb. The only thing I didn't like is how bullet sponge-y the bosses are. Most of them have two phases and you can spent minutes fighting them only to start all over everytime you lose. Especially the last boss is some major bs and I didn't even care to beat it. I don't have patience for frustration in my life anymore.
Otherwise it's a great game.