Same with me. In my 20's I adapted a dream machine with a LP player, and experienced fractals very colorful, clear and complex. With this app, now in my 40's, it was only the flickering, with some suggestions of forms and some nice body feelings. I thought that maybe the frequency was too low, or the flash of my phone was weak. I will try later this other app (https://play.google.com/store/apps/details?id=com.tp77.Strob...), that allows to specify the HZ frequency. I remember that the optimal rate for me was 12 HZ.