Yeah, this is an all-timer. Map makes full use of its space in some fun ways, and a really gorgeous visual design throughout. The scale and intricacy does feel in line with something you would see in Arcane Dimensions, some 10 years later.
The final horde fight is a LITTLE bit much for my taste (particularly if you're proactive and find the pentagram of protection secret at the start of the level...), but this is overall a masterpiece.
5/5