Oh my, this is great game, I really enjoyed it.
Visuals are beautiful and works pretty well with good sound design (some bg music would be nice bonus though - personally I mute it soon anyway in this kind of games, but having the option is nice).
Gameplay itself was fun.
My biggest comment is on inability to merge heroes directly from the shop (or did I missed something?). You have to buy it first, which creates necessity to permanently keep one spot unoccupied. On my first playthrough I even got softlocked, because I had one of each kind party and I was not able to buy anything.
Awesome job!