I've been really busy and still haven't had the time to finish my first playthrough, but I'm pretty sure I'm near the end. I've got a lot to say, maybe I'll post a detailed review later, but in summary I think the game is fantastic. It's definitely better than I expected it to be. A lot of the things I thought would bother me turned out to be things I really appreciate for unexpected reasons, like the use of 3D instead of 2D graphics, the atmosphere, and the lack of the Castlevania IP. Personally, I'm liking Bloodstained more than any Igavania that isn't SotN, and even then, I feel like Bloodstained does certain things better than SotN. I'm going to try to find the time to finish the game this weekend, and I'm already excited about trying to specialize in different weapons and shards during my second playthrough. Iga proved that he is still more than capable creating great exploration platformers, and I hope he continues developing the Bloodstained franchise further.
That being said, I have ran into several bugs, and I'm playing on what should be the most stable version, the PC version. For example, one time I went into the menu screen and Miriam's character model was missing it's head. When I tried to exit out of the menu, the game crashed. I also got stuck in water once, like my controls for Miriam were disabled when I jumped in the water. Luckily I was able to enter the item menu and use one of those items that teleport you back to town. The buggyness of the game is its biggest fault for sure, but luckily its something that can be fixed with updates.
Also, I think someone else mentioned it before, is the red moon in front of the castle a bug? If there was some sort of story explanation for that I haven't seen it. I don't see a possible reason for the moon to be overlapping in front of the castle so I figured it must be a bug.