Although I didn't include it on the design document(I have to update it), these are the items that will be in the game:
Blocky Dollars - Collect 100 to gain an extra life.
Dr Joe - Recovers one health point
1 Up - Gain an extra life
Energy drink - Run faster for a short time
Jet pack - Enables higher jumps (deactivated when hit)
Blocky shield - Invincibility for a short time
So, I have to start working on these items.