Tower of god is a story about a boy named 25th bam (or night) and his goal to chase after his friend rachel who decided to climb the tower of god. You can get anything you want if you manage to climb to the top of the tower of god.
That description itself is already more revealing than the one on webtoon and anymore would probably be spoilers.

Story: 10/10
The story itself is really interesting and, if you are like me, will have you looking to the wiki simply out of curiosity. (I highly recommend you do not visit the wiki until you are up to the latest chapter, as it is very easy to accidentally read spoilers. However once you do catch up, you should because apparently there is a fair bit more information revealed through the author's blog and if you are genuinely interested in the story, setting and world building then you will like it.) The story is told in a way where we receive about as much info about the world as the mc, where there isn't any random info dump where a character will start rambling on unprompted. Some might not like it since you don't get the answers to your questions right away. Some one else said that it seemed like the author was making stuff up in an as-you-go style, but it doesn't feel that way to me at least. The world of tower of god is so massive and there is so much going. Each floor is basically a world of it's own but it never seems like there is too much going on for it to work together. Idk if this would fit into a setting category but there isn't one so I am just gonna put it here.

Art: 9/10
I say 9 solely because of the, um, rough art in the earlier chapters. Trust me, it gets a lot better. In fact just recently, in chapter 480 and the fight looks amazing. It probably won't hurt to have a look if you are a beginner cause the events are so far away that its basically not even spoilers.

Characters: 10/10
Pretty much all the characters make sense and have pretty valid reasons for doing what they are doing. I say pretty much cause there is just 1 that I don't think anyone understands and you'll know who i mean when you start reading.
The character development is really something, especially the development for bam. It is really enjoyable to have a character develop so much. He is still the sort of "I must save everyone" shounen mc but he in every other aspect he develops so so much and he is still developing. He literally changes in the latest chapter.

Enjoyment: 9/10
I put it at 9/10 cause I did have to somewhat grind through the start. It was certainly interesting at the start, but bam being way weaker than everyone + the art + the overcomplicated games made me pause and come back a few times. But I have definitely binged the last 250 chapters at least. Most of the overcomplicated games have stopped. This means that the fights are more similar to other shounen fights of just punching your opponent harder but it is still quite enjoyable. I just wish khun would use his brains again cause he hasn't done anything particularly cool in a while, mainly just relying on his latest power up.
The chapter length is also really good, with chapters being significantly longer than other series (or webtoons at least). Unordinary is another webtoon (that is also really good) and it can take less than a minute to get through a chapter whereas tower of god will take a few minutes to get through at least. This means you have a lot to binge through and I personally enjoy bingeing it more than waiting on a week to week basis.

Overall: 10/10
If you average it out, it would be 9.5 but even though there are 9s in there, tog is definitely a 10.