Helena

You’re a captain in your own little yellow submarine. Your mission is to get as deep as you can, but your journey will be hampered by a host of sea creatures. Your only options of survival are upgrading your ship and avoiding the creatures.

You control the sumbarine with WSAD, you can access upgrades with U and your journal with TAB, you can scan creatures and objects if you keep your mouse on them for 3 seconds. You can’t scan the small fish and scrap, just so you know.