I have completed both campaigns of EMW5.
Levels: I must say, the levels are fun. I like open but linear levels, they are fun to speed through. The Mystic Ruins are well made, but kinda confusing; I find myself running around like an idiot not knowing where to go until I somehow find my way to the next zone.
Graphics: I don't like the corpses and gore, this calls me back to sonic.exe (which I dislike). And also, using metal sonic as the character who kills makes me annoyed because he is one of my favorites, and the comparisons between him and exe stuff are unbeatable.
Music: The music is good, even if it is taken from other sources. For as far as original goes (i believe), I like the "metallic" version of the Mystic Ruins song, and also the Not So Green Hill songs. Sheesh, this mod is not beating the sonic.exe allegations.
Bosses: The battles against Eggman are eh, the Goop one gets so fast to a point it's almost impossible to defeat. The battles against these "metals" are quite annoying, the projectiles, they're super fast and hard to catch. Mainly in the Mystic Ruins battle, since there are FOUR of these to defeat. And the final boss has an insta kill attack if you're not careful, and obviously that is annoying as well.
The port itself is fantastic, great job. I must point out that the guy who made this mod originally also made the FNAF Doom series, which is a crazy fun fact.
If you ever decide to come back or maintain this along with me in the future (like the old times lol), please let me know!