Wow, that's a lot of content you have here! Love the art style and colors. It's surprisingly uplifting considering the topic.
I recorded some of my playthrough and can upload it if you're interested (my solution to the puzzle with the 3 buttons will probably bring tears to your eyes, I'm pretty sure! :D)
I encountered one bug that required a restart. The first time with the portals, I managed to grab 2 of them and while ducking with 2, it managed to teleport me into the ground where I got stuck.
I think I was close to the end, but I had to call it early. I might jump back in tomorrow to see the end. :)