Kuro5hin has an interesting article about common indie game developer mistakes.

These include too much abstraction of important design features, too much detail in the wrong places, reluctance to just release a finished product because it is never 'quite good enough', and taking on too much work themsevles.

Knowing what and when to delegate is an important thing in indie development, but it is possible to develop alone, as long as you know your limits.

The article is well worth the read for anyone interested in making games themselves or in a small team.