There currently isn't any skirmish mode, but we're hoping to get the chance to work on it in the future - a lot of it depends on how the game continues to perform. But it's definitely something we're looking into! With regards to the length, it's most likely going to be longer than 3 hours - depending on your skill level, it's usually around 6-8 hours (and more often even closer to 8-10). 3 hours is closer to speedrun time. In total there's twelve missions, and some of the later levels can be quite challenging.
Hmm. I guess I'll get it then. I watched some videos of it and it looks highly unique and interesting. The music is cool too. Will grab on FMA now then.
Ok, this has gone sufficiently off topic to shut it down. Talk about amoebattle on the amoebattle thread thanks.