Making Gunpoint’s Save System

Gunpoint’s current save system is rough, but functional if you know how to use it. The game autosaves every ten seconds, and when you die, a message pops up telling you to press L to load the latest one, O to load the one before, or R to start the mission completely. It’s just placeholder, but it’s close to what I want: you should never have to repeat a chunk of progress you’re happy with, only the bit you actually screwed up.