I love the idea of this app. There are still a lot of things to improve though.
First thing: The camera filter is a bit too bluish, I would prefer a vintage look with a little brown, or maybe a few options to choose from. Also, there should be the option to edit the photos afterwards so that you can f.e. remove the filter if it doesn’t fit the picture. The quality of the photos is alright.
For me personally it’s not a big deal that only up to 10 persons can join for free. You could also make two different shared albums so some photos are uploaded into the one, and some into the other.
In addition, I think that the design is a little bit chaotic, at least the first (left) page. Maybe you could make it more simple. I like that you can quickly have an overview of the shared POVs though, that’s practical.
Oh and also, you can only create a diese App from now on until a certain day/time, but not „from x until x“! For example, if you already know when your party is gonna be, you could plan it beforehand and already send the QR codes. That would be a good option as well.