FNF Prey sounds familiar...
The gameplay used in the video and the uploaded boss theme are both not mine. Below are links to the 2 videos from the original video publishers.
Prey - Vs Sonic.exe (cancelled 2.5/3.0 update build) gameplay: • FNF Sonic.EXE 2.5/3.0 Cancelled Update - P...
Sonic 2 Eggman Boss Theme: • Sonic 2 "Dr. Robotnik's Theme (Boss)" Music