Good Stuff
All of the little character designs are adorable, and the variety is wonderful. There are definitely some unique designs in there. I think the overall visual vision for the game is cohesive.
Navigating through the menus is quick and responsive, and the animations/transitions included look good. The layouts are nice and the stat information pop-ups are useful.
The combat animations are simple but effective.
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Stuff to Consider
I think the thing that stood out the most to me was lack of communication with the player. Here are some examples:
Having a "Back" button in the Shop would be nice, as navigating back through "Team Viewer" isn't intuitive.
Also in the Shop, a short text explanation on the screen saying something like, "Pull characters/relics to form/equip your team," would be helpful for anyone new to this game type.
In a similar vein, when starting the tutorial, seeing the circle on the screen was a little puzzling. Once clicking it, an arrow appears, but there is no information as to what that means or what you should expect next. A text at the top with "Select a Level" would be great, and once clicking the circle consider also having the Team Select also appear (instead of requiring a third click), or a prompt like, "Choose a team for this level? Y/N".
When selecting characters for the level, you cannot see their stats/abilities, which is important for this type of game.