I actually just finished the Anime not too long ago. It was definitely a departure compared to other ones. Alot less action for it's catagory, more mystery, not too background on many of it's characters, unique art-style, and it's setting is again, mysterious. It's an odd but refreshing show compared to it's contemporaries and it's definitely a "hate it" or "love it" type of program. My girl hates it because it gives little background and she's the type of person that likes explainations on character's backgrounds, their reasoning/rationale, their motivations, etc. I think we're all spoiled with anime answering question about every little thing and "Tower of God" keeps things super mysterious and kinda just lives for the moment and provides information in a methodical manner. It's not my favorite anime, but it definitely has my attention.
Also, I just found out that the HunterxHunter continued while the anime stopped short of certain arcs!!! That kinda took the wind out of my sails in regards to running through the story because I usually don't bother with shows that get cancelled or doesn't have proper endings.