The ones you liked the most.

Here's what I made for the jam with that concept :D https://mikdionio.itch.io/wrecking-bullet

Unusago: One world, one archer, one arrow!

https://itch.io/jam/gmtk-2019/rate/461869?after=20#post-889574

Best

Check out and rate please. Tell me what do you think. I'm very curious. Made this in 24h first time drawing anything

https://itch.io/jam/gmtk-2019/rate/462377 https://youtu.be/QVIS8fesZrA

I think you could call this game and only one bullet :https://itch.io/jam/gmtk-2019/rate/461770

Here's mine! https://itch.io/jam/gmtk-2019/rate/462609

Here's what we made: https://charliechumbuck.itch.io/thevengefulorb

Here's what I made, I would love to hear your feedback guys: https://itch.io/jam/gmtk-2019/rate/461454

Is it fine if the *enemy* has only one shot, to kill you, that is? 

If that's fine, then please try Operation: One Shot!
https://itch.io/jam/gmtk-2019/rate/462383

Check out the game called Only One Shot, it's quite a different take and it's hilarious, hehe, I personally recommend it

heres mine, you have to pick the bullet back up after shooting it and there are power ups that spawn in the level to change how the bullet acts. https://itch.io/jam/gmtk-2019/rate/462242  

This one kinda applies

It's a 2 player 1v1 (With an optional build that has an AI) where there's only one weapon:

https://risgrynsgrot.itch.io/the-one-spear

Hey here is my game! You have only one bullet and you have to decide if u suicide yourself(let you corpse there) or kill a zombie so the next surviver can have a better chance https://itch.io/jam/gmtk-2019/rate/462201