Edit: (In hindsight it felt a little rough jumping straight into all the things I think this app lacks, this app is very well made and while I have had to work around some things, it is the most featureful "pngtuber" app I have encountered so far)
The layers as they exist rn are serviceable, but it would be nice to either have a higher layer count or otherwise a more limitless system. I've made a character that uses lots of layers to express depth in motion and 5 is a little restricting with all elements in consideration.
Additionally a more dynamic solution could give way to layer groups, which would be a nice way of showing/hiding larger components of the character that are comprised of many smaller parts.
Playing off that, some means of showing/hiding layers would be very nice, at least in the editor, maybe the sort of thing that it disappears when you click out of the window and the program enters the "preview"/"live" mode so all layers are visible again?
And the last suggestion I have, the look at cursor values should be able to be put into the negatives and also able to be input manually. The character I am working on right now is a low res pixel art style character so maybe it wouldnt be such a noticeable issue for normal characters, but I was having alot of trouble getting the numbers to be the exact values I wanted them to be to achieve the depth I was looking for.
As for negatives, it's pretty simple in concept, you want the body to be the "center" of the depth and not moving with the eyes? but you have an element you want to move behind the character relative to the view? Like maybe a halo or wings or something? give it a negative value and it will follow the cursor inversely, in my case I just want this to have the hair behind the head move around a bit.
This is definitely alot of suggestions but I see the app hasnt been updated in a while and I'm not sure where to go for update news so above all I hope that such a nice tool hasnt been abandoned. Cheers!