For a fan-game Sonic themed Doom mod, this game is actually really fun. The visual style is from some alternate late-1990s where Sega actually put out a 3D Sonic during the N64 days. The levels are neat and clever, the music is top tier, and best of all it's free! The one downside is that they have a lot more faith in Sonic's platforming handling than I think they should, some of those jumps are p sketch to pull off.