The framing of action and panel layout is garbage, the art is mid at best and the pacing is total trash. The point of view most of the time feels too close or too zoomed in on things to feel good. Half of the action scenes are close up shots of weapons or parts of weapons. The combat doesn't feel fluid or dynamic at all, similarly the dialogue feels stilted further hampering the pacing. I've never read the novel but this is low mid, 4/10
At least you weren't like nizz and gave a completely shit review. Though you should make your written reviews more universal(most people will consider the art ok as it really isn't that bad, your review seems extremely biased towards art and even then it's not a very good end rating based on the things you said)
Here's my review:
Art:5/10 mid but not below average(this is after being heavily influenced by your review, in my personal opinion around 6.5/10 is more universal but since you insist the art isn't good imma just lower the rating)
Storyline: 6.5/10 I would rate higher but its not like one piece where everything is well planned and detailed, the storyline is a little messy in the beginning(mentioned something about a game but completely ignored it after even though it could be slightly expanded on to make it make more sense)
Concept 8/10 very very good concept, although they never put an explanation on how the mcs body can handle conflicting types of mana the concept itself is extremely creative and not reused in any way. Not 9 because it is not that specific or that well though of and doesn't have many subtypes or is the kind that is simple in concept but versatile and not 10 because it isnt a long lasting power concept like haki or devil fruits which can easily introduce new subtypes or ways to use the power concept so it will not last more then 200 chapters if it even reaches that far. I also reduced half a point cus the concept of mana and holy power is often reused but since it's a unique way of using it I didn't reduce more
Overall: 7/10 very creative power concept for the mc even though the energies are kind of common in manga, storyline is above average but art is simply just average. Worthwhile read if you already read the more famous ones. Would recommend to people looking for manga to read after running out of chapters in the manga they are reading but wouldnt be the first recommendation I would give