Nihilumbra is still a good-looking platformer for its age. There are a good amount of levels and it didn't feel repetitive, so the price is okay for me.
After you finish the story, you can play through the game again, but on increased difficulty. This is where it really picks up and where you really notice the age of the game. You're more likely to die because of the controls. But since you only have to play this part for achievements, you can ignore it.