I've owned one, though i never programmed for it. But from what i know, i guess the answer is that the amiga is very close to a modern computer, in that it has specialized chips for graphics and sound (Denise and Paula), making many tasks quite easy, but is still weak enough to force most programs to be relatively simple.

At the same time there's also still a very active competitive amiga programming community², making things like these:

https://www.youtube.com/watch?v=GE7vbzMYYRc -- https://www.youtube.com/watch?v=EpK3Kp7-0zU -- https://www.youtube.com/watch?v=RPdB_zdyMbM -- https://www.youtube.com/watch?v=7cOjC-nhs_o -- https://www.youtube.com/watch?v=jziQBWQxvok

² http://www.pouet.net/prodlist.php?platform%5B0%5D=Amiga+AGA&...