I recommend Neon Adventures. The movement has sort of a floaty space physics that feels slightly like a space combat game (i.e. Red Nova) that I enjoy. The level designs are challenging involving timed challenges with color scheme obstacles. The powers/items on the left side are purchased with currency that can be earned in game (albiet slowly) and the items don't seem necessary. Obstacles are mostly lifeless objects. Parts of this game remind me of Tilt to Live or Hyperlight with great emphasis on environmental puzzles rather than combat.
Edit: In game currency and shop make me suspect IAP is likely but that does not appear to be in place yet.
Last edited by undeadcow; 12-08-2012 at 11:19 AM..