I played the arcade version. A really weird game, combining an at times very difficult Xevious-style STG with an incredibly slow Rolling Thunder-like. I don't like to abandon arcade games, especially since they're so short, but I just got insanely bored with this one. I played through a few levels waiting for it to get interesting or even halfway fun, and it never did. The NES version of this game sounds a lot more interesting, since it was developed concurrently with Mega Man 2 and uses some of the same assets.