Streamwreck is made and sold by Andrew McGraw, an individual trading as Streamwreck, in the United States.
Write to 8mcgraw@gmail.com. One person reads it, so plain English and a screenshot beat a formal bug report.
Email the same address, from the address you bought with. If you have lost your license key, say so and it can be looked up and sent to you again.
The refund policy answers most purchase questions, and the safety page covers flashing effects and photosensitivity.