Checked out what's here so far; definitely looking forward to seeing more in the future!
My RAM usage spikes pretty hard sometimes, even with the fast graphics setting enabled. I'm not sure if it just doesn't properly save across sessions or something, but I'm pretty sure it only happened when it was raining but only sometimes. It's noticeable since my laptop's bad so when it uses enough the game just freezes.
I feel like using the april fools gacha slightly spoiled my experience, since it means you can completely ignore a lot of the progression measures (it gives you like 10 times the items you'd obtain in the same amount of time without it) and it wasn't telegraphed that it'd do that (since you get access to it before you see how much stuff you can get normally). But I ended up barely using items in combat (a few MP heals when a battle begins and I was at low MP, and some health pots for Astraea are the only important ones, I think) since combat is easy anyway, lag from the above issue aside.
Combat balance is a pretty tricky topic that I'm sure you'll need to finetune more in the future, but I spent most of my time running Holy/Sky. Holy felt like a must-take, perhaps partially due to game mechanics not being telegraphed enough--I'm not sure if "you can only counterspell a sanctioned enemy" means it just hits you without you getting a chance to counter it, but I assumed that that was the case and thus always started every battle with sanctioning the enemy since not getting hit is useful. And then Sky is just absurdly OP compared to everything else, of course; I think it definitely needs its wounds infliction reduced.