Gave this a spin. I'm sorry in advance if this sounds harsh or something, I didn't mean it.
My first complaint about the UI/UX design and the battle system is, in fact, I couldn't tell who is going to act next. You zoom up close to the actor when it's their action, cool, but... I couldn't see any other battlers, both actors, and enemies. Granted, when I'm going to input an action, you zoomed out it. However, the lack of ATB bar shown didn't help either. Upon the idle/waiting phase, my eyes went everywhere seeking who is casting, who is waiting, who is going to act, then a battler acted, and I wasn't expecting it. If you can make the turn order more visible and/or predictable, it may improve the battle experience a lot.
My second complaint is about how slow the animation is. Maybe slow, or maybe lack of feedback? I finished the battle at 4-5mins on average. And I mostly think it's because of how slow the animation is executed. As for the lack of feedback, it's related to my first complaint. Your normal attack sequence and some of the skill animation did a good job of bringing focus on who's attacking and who's getting attacked. However, iirc the enemy didn't do the same. Does enemy has an animation that zooms up close and personal to tell "this enemy is going to attack this actor"?
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And also my random thought since I'm not sure if this is really a complaint or it's an intended design, or I'm just missing something.
First, the lack of "movement" in the grid battle system. I was expecting I could move around during the battle between the grids to switch into the defensive mode or go full suicidal mode by sending all of them in the frontline. But no, I didn't see any move command to other grid. So the grid is basically just a post that "well you're standing here, good luck surviving".
Second, is the lack of learning curve. True that you have a tutorial land that explains everything cramped in 30 mins (which I think I passed most of it since I already know most of basic RM games rules lol). But at the start of the game, you gave me a full 4 party members with each of them has its own ability I didn't know about. In fact, I used it mindlessly and had no idea what I'm doing lol. I managed to survive most of the encounters though.
Third, is the wall of text intro without a proper image. Now don't get me wrong, I understand that you're no artist. But it's also mean that I might not even understand what was going on, so I ended up skipping the entire intro. Granted, English is my second language. A text-only usually often bore me. Because it's kinda hard to visualize what's going on without an actual image.
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I think I have some more in my mind that went gone while typing this. But anyway, that's some input for me. Good luck!
EDIT: I've seen through the audio folder and some of the go beyond like 5mb to 10mb. How many kbps are your songs?