Thanks for signing up so many years ago!
What you show is definitely not supposed to happen. It shows no subpixel precision and no pressure sensitivity. Your pen basically behaves like a mouse for some weird reason.
I am not sure what the problem is, but I know of others that have had succes with installing the WinTab driver. Could you try that please and then run Animation Paper again? I think you should be able to download it here: https://www.microsoft.com/en-us/download/details.aspx?id=38826
Let me know if that changes anything.