Found this to be relaxing to play =]

IMO you dont need to add shooting, the focus on dodging and collecting is simple and fun.  

Suggestions:

• Change the initial spawn bounds of the "enemy" circles so that you don't auto-lose at the beginning.  Maybe Try having things spawn closer to the edges. 
• Randomize initial directions 

Some more ideas:

• Changable settings: ability for player to add their own words,  adjust number of enemies, size of map, decide if order matters or not, etc. 

Overall, I liked the simplicity of the game.  It was frustrating at  first (in  a good  way) but is really fun when you  have "close-calls" and have to dodge.    :D