Glitchspace (alpha) | IndieGameStand | £0.59 minimum (save £4.40)
As the name suggests, Glitchspace is an ambitious first-person... programming game? Yes, it's effectively designed around the idea of visual programming, with the scenery and objects within the world representing code rife with glitches to create or exploit. The project currently in alpha (what glitches are intentional and which are just early access quirks - a fun metagame, perhaps?) and available for £0.59 minimum at IndieGameStand. The RRP stands at £4.99 so you'll save a decent amount, though I can't personally vouch for whether it's a worthwhile buy yet. User reviews are positive, but of course, they so often are.