There's lots of spots where you can get stuck. Really needs a "reset position" option.

I played for a few minutes. I wasn't able to deliver packages either.

I also didn't really understand how to do it, but I liked the game, it's so beautiful and peaceful, it's a shame there's no chat and you have to speak through emojis.

You need to click on npc to start conversation, one of them is office worker, he will give you a delivery

On the other hand, I'm so glad it didn't. I enjoyed a few minutes of exploration before realizing what I was meant to be doing.

not likely to be your problem, but if you are using firefox resist fingerprinting, you need to whitelist most webgl apps that use large textures, since resist fingerprinting forces a standard texture size that is a bit on the small side. or maybe your machine is really old and you're hitting same problem for real. the game doesn't really detect errors.

Threejs is like the jQuery for building 3d stuff. But it's not a platform like Unity or Unreal engine. But it doesn't look overly complicated.