Unfortunately, as stated in our safety information, there is a chance that the app can trigger headaches or migraines for those with photosensitive triggers and also motion sickness.
For some with less severe responses this can be rectified by moving the phone back and reducing the light intensity. However, if you are at all uncertain, we would always suggest avoiding use until you have consulted with a medical professional.
We really hope this helps. Please let us know if you have any other questions.