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Once claimed, the game is yours to keep forever without having to pay a penny.
Magrunner: Dark Pulse is puzzler that is somewhat similar to Portal or Quantum Conundrum but with a decidedly Lovecraftian twist on the story. It's quite a bit of fun and for $0.00, you'd be stupid to pass it up.
In addition to the free game, GOG has a massive Summer sale going on right now. You can save up to 90% off of a variety of games and bundles including the Ultima franchise, Hitman, and tons more. Again, simply head on over to GOG.com and check out the main page for a taste of what they're offering.