It's difficult these days to find some good chiptune albums and songs, but if you're looking for an amazing collection of songs then definitely throw this guy a dollar or two for this amazing collection of songs! ;D
Favorite track: Time and Space.
An awesome set of tracks here, each appropriate and effective in the game. Even though Pause Ahead has nothing to do with Tower of Heaven, I can hear a nice correlation to the spirit and emotions in Tower's tracks, especially with the determination in "Boss of Nova".
Favorite track: Boss of Nova.