I have Coded Arms and Lumines.
I did find coded arms tricky to control at the start but after a few levels I now find it much easier and great fun to play and the graphics are fantastic (the shotgun rules).
While Lumines is just a puzzle game.
I have coded arms its not very good, quirky controls, usable yes but could b better i think there a bit to sensitive. Its to linear for me, its just a point a shoot fps not else much going on tbh. Lumines on the other hand is one of the most fun adictive games i have ever played. never seems to get old. Id go with lumines.