Type or Die

Type Or Die: The complete space typing simulator! Defend your ship from the onslaught using powerful typing attacks!

Features:

• Cutting edge graphics and sound.
• Realistic keyboard physics.
• Accurate RSI modelling.
• Supports multiple keyboard layouts, QWERTY, DVORAK and more.
• Support for mechanical and electronic keyboards.
• Huge vocabulary of words.
• Dynamic phrase generation.

Type Or Die is an open-source game, you can find the source here.