Adding new scenes is a lot of work, despite that most players think otherwise. My current support level doesn't exactly allow me to kick down the door at some pro's house, throw a bag of cash in their face and announce that they are working with me now. So, yes, with only 1 artist having enough skill to probe the ideas for new scenes while others are propagating existing concepts can be pretty slow.
Still, I think we are doing more than enough if we'll compare us to other 2d animation games like Cloud Meadows. Even with their ~16,5k support just from Patreon alone, they decided that fully animated hd scenes are too much hussle, and switched over to pixel art H scenes. Meanwhile, we are doing these with ~1.5k support. If you want more scenes and faster - you know what to do.