Deeper Gaming: Fathom

I just spotted this exquisite little game by Adam Saltsman over on Offworld. Fathom starts with blistering chip-core-fuelled platform battling and... well, there's a little surprise waiting in there, which I couldn't possibly spoil. It might seem a little confusing, and it is cryptic, but all the clues are there. Oh, just go play it - and beware of spoilers in the comments, please.