Couch co-op.

I've always wanted a sci fi themed game that plays like a Diablo style dungeon crawler. Sort of a cross between Duskers and Diablo, if that makes sense. You travel in a junky ship from space derelict to space derelict. You (and your party) explore these ghost ships looking for gear and upgrades for yourselves and your ship.

The overall story would be some quest for artifacts and navigational data to help you open a warp gate and escape the dying star system. You'd have playable classes like space marine, psycher, technician, doctor, etc. NPCs could be a variety of monsters and zombie astronauts. There would also be environmental hazards and puzzles and such.

Sorry, this is probably waaayyyy more than you were asking us for. Ignore me or cherry pick anything you like. =)

Cheat codes that are helpful in allowing people with not enough time to sit and grind things out or fuss with mods to play through the story while still interacting with the core mechanics.

i miss text based muds

more text less 3d

Ridiculous physics is always fun.

Add a rolling (dodging) mechanic, even if it's not a fighting game.

Rolling HP like in Earthbound and Mother 3. You get a big hit - your HP does not decrease to the point immediately rather starts rolling down, even if you've got a mortal damage. This way you can still have time to finish the fight and survive if your HP don't reach 0 in the meantime, or even heal yourself. Also Luck (or Guts) as a stat, which can sometimes leave you at 1 HP no matter how overkill damage you just got.

A procedurally generated escape the city third person zombie shooter with several randomized unique quest lines that can be discovered by scouting the city. Each quest line leads to a different escape route. (Military has surrounded the city)

Zombies should be 28 day later, one touch and you are infected zombies.

Maybe add some basic crafting and possibly coop or pvpve elements. One escape should take only a couple hours. The randomness gives the replayability. (A bit rogue like)

The narrator

A bucket of dehydrated water, which you have to reconstitute by adding water, in order to put out an invisible fire. No idea what kind of game you're making, could be a very odd addition to something like a racing sim.

1. Character creation

2. A hairstyle option that is actually a toupee. If your character is hit / impacted / falls / etc, the toupee can sometimes fall off l. The character suffers a debuff until they pick it back up or buy a new one. It is not apparent during character creation that what the player is selecting is a toupee, and the mechanic is not explained in any way.

I really love when RPGs give unique dialog options based on non-dialog skills.

For example, if you are spec'd into a certain class of weapon you unlock dialog with a relevant vendor. Or if you have a high gambling skill, your character can talk about the finer points of gambling.

Taking this a step further, reactivity from having accomplished something requiring application of these skills allowing unique dialog.

This can all either be unique flavor dialog, dialog that gets the conversation to where it would have gone anyway, or dialog that opens up new quests or quest resolutions.

There should be a mode where you can sale propane and propane accessories.

Activate god mode and gain a small fraction of the power of the developer. You can edit the actual source, brick yourself, and quick reload from within the game. Show me the real errors with the file name and the line number.

I want the things I do and the decisions I make to actually matter to the story and not just like a good or bad choice shit either.

Big ships with realistic controls

A game where you can program spells with pseudo code.

Cat

License the game under the GPL, the game itself is a boomer shooter (using the GZDoom engine ofc) where you kill proprietary software executives and other anti-libre demons to free Linus Torvalds from the grasp of Bill Gates.

REAL CAR ACCIDENTS!! 🚘💥🚙

Often times, games underplay the medical and psychological impacts of traumatic events, so we unconsciously think that we would generally be fine if we were to experience a car accident.

While morbid af, I think it would help advocate for victims of trauma and loss. Also, it might encourage to people think before they behave in ways that are too risky when driving.

A 3D rail shooter where you play as various ranks of biblically accurate angels shooting down demons.

In a space game, more consistency with application of artificial gravity tech. If all floors can pull you to them "because science" then a realistic consequence would be regular use of walls / ceilings as walking space for more efficient spaceship layouts. It could add an interesting dimension (pun intended) to exploration / combat etc depending on what your game is

Reverse Microtransactions

so many frogs

I want to run over, climb into my X-wing, power it up, and fly out of the hangar into the ongoing battle. I want a fully simulated astromech droid too, with its own mind and memories.

Capitalism! in the modern area with a tad more complexity.

Want your game to pop? Include a very loosely hidden secret mode where you can choose to have MC replaced with genocidal Israeli politician Ben gvir. Have enemies be replaced by only women and children and include soundbites of Israeli politicians calling them human animals and that all the killed population are Hamas. Unironically I think this would explode sales.