Well the first movement is better, but still just ok, unless your aim is early minimalist, electronic music in stasis - in which case it's great! The other movements do not seem to ever move away from the same key, and whilst this is fine if you always want to write in the early minimalist style, if you want it to sound better you should include more modulation. You should get your hands on some recent Reich, eg "You Are" Variations or Music for 18 Musicians - these show modern minimalism which never gets boring.