Slain - Back From Hell. Whilst I keep buying and picking up 2D 'Metroidvania' type games in bundles, I usually play for half an hour and then don't go back to them. This time however, I keep coming back for more. The difficulty, gameplay and most importantly, the placing of checkpoints is spot on so that the challenge that makes these games what they are is there, but without the frustration of having to go too far back and replay when you die. It also looks and sounds awesome. Reduced to £2.50 on Steam just now...