First off: This is meant to be an educational experience, if you don't like 'games' like this move on and don't read further.
The levels are composed of letters of whichever font you're playing, and they look gorgeous.
Everything is simple, yet aesthetic. The music fits, spot on. I was surprised on how everything works so well together. Each world has their own theme that reflects the font (and the era it's from). For someone like me, who didn't really know anything about font history, Type:Rider was truly informative. It never seemed boring and always kept my interest.
The only downside I can think of, is that sometimes the physics seem a bit off. Otherwise well worth a buy, defenitely while it's on sale.