I have two ideas, one that will be up in a day or two, and the other I am not sure if I will finish in time for the Jam, but will be getting made eventually regardless.
1. The Buried. You are a miner who survives a cave in. Only, you now find yourself in a strange system of tunnels that no human hand dug. Introducing a mechanic for darkness...basically you have a limited number of charges for your headlamp, and you choose when to use it (each charge is good for one card). If a card has the darkness modifier, you have to pull twice. There will be ways to add to your charges (one of the Aces for example).
2. The Forlorn Hope. There were military units called Forlorn Hopes. Basically they got double the pay (unless they were convicts being forced to join), but got sent on all the suicidal missions like being the first wave to attack the walls. Young officers would take the risk leading them however, because if you lived you were sure to move up the ranks. So you'll be playing a young officer trying to keep as many of your men alive as possible, and staying alive yourself, for the duration of the campaign.