That old days. It was around the time that the city was full of game centers. There was a game I loved.
However, there was a bug in the early version of this game, and we were able to keep killing enemies under certain conditions. Although it was a technique to earn points, I remember having a nice trick and having had a lot of fun. After that, the bug was fixed, this technique became unusable, and the game disappeared sometime.
This is a "mini game" homage to it as "GanGanGaGaGan!" If you know those days, please also try playing with a little killing time for those who do not.