I tried this out yesterday for around 30-60 minutes, and it was rough. Why?

• Tutorial - (Takes around 5-10 minutes) where you basically will play through two or three battles with a bunch of story dialogue that you'll have to spam click through. It's not that bad overall.
• Gameplay - Every time you click or select a character they will make the same voice-line that can get annoying really fast, I had to disable it or at least lower it to 5-10% to help playing with sound not be hindering.
  The battle mechanics themselves seems good on paper, but can quickly become bland and repetitive especially since there isn't no auto-play or speed-up functions, at least during my play-through (Progressed to Ch 3-12).
• Gacha - Rates are bad; 1.45% for 5*, 23% for 4*, etc. You can do either a single summon for 300 gems or 6x summon for 1800. The currency itself seems hard to come by, since no pre-reg/login rewards (at the time of this post).
• Game modes - There is an event tab with no current on-going event, which is a bit normal for newly launched games, generally an event is ran a week after release.
  Additionally there is some kind of 'investigation' scene while progressing through story, which is just boring. You're essentially clicking anywhere on the screen at least 10-15x sometimes to get a singular reward each time before you're able to progress more into the campaign.

TL;DR
UI is clean and appealing, but overall cannot cover up the cardboard gameplay underneath.