The devs should improve the gameplay
First of all, I really like the game the game. The gameplay is ok (but needs improvement), the music is good, the characters and their designs are great as well as the stage, the interface is also beautiful, and lastly the gacha rates are great.
However, as I said in the previous paragraph, the gameplay needs some improvement, most notably in the amount of control the players has to the characters in the battlefield. While playing the game I've faced some issues that really annoyed me such as when I deployed a healer but instead of staying with my ranged characters, she dives into the enemy camp, leaving my other characters alone. There's also this incident where the characters get stuck when it's crowded, of course it'll eventually be resolved but it will take at least 5 seconds which is bad since there's a time limit necessary to 3 star clear a stafe. Another issue is when characters get confused on where would they go even though when I deployed them, the arrow literally points to a path. The main problem is that they'll take a few seconds to go to their designated path which is a huge waste of time. Now what annoyed me the most is when enemies spawn at the back of my characters, the scenario itself isn't a problem but the fact that most of the time, my melee characters have a hard time reacting to the new enemies (even when they're not battling enemies). It's so annoying since my backline would just be squashed. Of course there's the return option but it has some issues. First, it's limited, at most you can store 2 instances but is it enough? No. Second, after using an instance, you need to wait a few seconds to use it again. Third, you can only redeploy them inside a specific range which is bad when you're battling deep into the enemy camp. Lastly, it only provides a superficial amount of control to the battlefield which is bad.