A friend of mine made me this concept art for Brinedoom 2D! He insists that I should add a robot for the player to pilot. I also have some ideas I could implement.

2D sandbox game (obviously going that route)
10 hotbar inventory slots using the number row and 100 more slots adding up to 110 slots total
random terrain generation (maybe custom -X,+X for experienced people) 3000x3000 as the minimum
temperature
death to heat stroke
death to frostbite
tomatoes (salsa, sliced, diced)
grapes
40 HP and hunger points
guns
playable robot