The night is dark and full of terrors, as you'll doubtless agree if you've played Minecraft or Terraria at all. Night is the time to shut the door and go to sleep, or (if you're stranded in the wilderness) to dig a hole and stay there until the monsters go away. Darkout (opens in new tab) - inspired by Minecraft and Terraria - takes things a step further, by smothering an entire alien planet in suffocating gloom. Stranded on a Metroid-ish world, you'll have to use light to your advantage to fend off an army of shadowy creatures - and that's in addition to the more typical survival business of gathering resources. The intriguing Darkout's currently in paid beta, and it's now available on Desura (opens in new tab) . Also, it features jetpacks.
If you're tempted - it was the jetpacks, wasn't it? - be warned that there's no demo to sink your mandibles into first, and that you'll need a spare £9.99. As it's in beta and currently lacks tutorial/control information in-game, you may also find this page (opens in new tab) worth a read. But first, turn the lights out and watch the following video.