The STGs were on the top floor, but it was mostly empty while we were there. There was someone playing the Exa port of Fantastic Danmaku Festival, on Lunatic.
Meanwhile, most of the STGs there were from CAVE and Raizing (and then there was Tatsujin Oh), and I honestly don't have much experience with them. The only CAVE STG I've cleared is Dodonpachi's first loop, but it's been quite a while, so I was rusty. I only played one credit, but I managed to get to stage 5.
At that time, I was more keen on trying out the games in a real arcade setting, playing Tetris the Grandmaster, Battle Garegga, Daifukkatsu Black Label and Saidaioujou.