I think it depends on how we define tabletop role-playing. I know that sitting and talking (with or without dices and with or without a GM) isn't the same as playing a role on stage, but the idea of "playing a role" seems close to me. The experience is physically different, but the group improvisation exercise is there and it was what I wanted to highlight.
Maybe it's a good way of introducing a new player of a precise audience to what they can be :) Anyway I sure need to develop this game a little more, even if the main thing is here. Thanks for your comment!