Quick Answer
It is romantic in mood, but this story is low spice rather than high-spice romantasy.
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This book is not spicy in the same way adult romantasy blockbusters are spicy. It is much more about gothic atmosphere, dark fantasy tension, and eerie relationship chemistry than about explicit on-page heat.
If you are deciding whether it is clean, low spice, or comparable to ACOTAR or Fourth Wing, the short answer is that this story leans fantasy first and stays in the low-spice range for most readers.

It is romantic in mood, but this story is low spice rather than high-spice romantasy.
It is much more atmospheric than explicit. The romance matters, but the reading experience is usually dark fantasy with attraction and tension rather than an adult heat-driven fantasy romance.
For most readers, it sits in the low-spice category. The book has romantic tension and attraction, but it does not build its reputation around explicit heat.
It is best understood as fantasy-first. The gothic world, cursed-magic setup, and atmosphere carry much of the reading experience, while the romance adds emotional texture rather than dominating the page.
It is generally treated as adult fantasy, but that does not mean the book is highly spicy. Adult tone and spice level are not the same thing here.
Compared with many adult romantasy bestsellers, it feels relatively restrained. Readers looking for explicit heat usually do not treat this title as a spice-first read.
For most readers, it is low spice rather than truly spicy. If you want gothic fantasy, eerie atmosphere, and restrained romantic tension, it is likely a strong fit. If you want explicit heat, it will probably feel mild.
Not for most readers. It is usually described as low spice with romantic tension rather than explicit heat.
It generally falls in the low-spice range, with more atmosphere and tension than on-page explicit content.
Compared with high-spice romantasy, it is relatively restrained and much less explicit.
It is more fantasy-forward, with romance contributing tension rather than dominating the story.
It is generally treated as adult fantasy, though the spice level remains low.
No. Most readers would expect it to feel much milder than ACOTAR.