As I have no programming knowledge and no money, I wanted to leave an idea for the game here. Maybe someone will take advantage of this.

Game genre: space tourism

Game idea: A space travel game in which: We choose the route, e.g. Earth - Mars, Then we choose the ship we want to go on a trip, And finally, we choose the time of our journey / the speed of our ship. The real time needed to complete the route or reduced as much as the player wants. Reduced time = increased speed without warp drive because this is a tourist trip

The game can be multiplayer or single player On board the spaceship, our character: -She will have a hunger bar -Ability to travel with or without gravity -We will be able to lie down when we want to turn off the game:

In multiplayer, if we choose the long way, our character will wake up when we enter the world and continue our journey

On board the spacecraft, it will be possible to: -Playing mini-games -Visit a restaurant when our character feels hungry -Flirt with guys or girls in voice chat -Ability to do role play

Optional: -Landing on a planet and exploring it -Buildings on the planet or without -Ability to visit all planets and moons -Ability to mod the game -Ability to make your own ship model

Well, the 1st question is, what game engine are you using? The options are many, but what system you use depends on whether it is 3d or not. For 2d games, I recommend gamemaker studio 2, which is very beginner friendly. As for 3d, try unity 3d or unreal engine.

There's a game here on Itch called Space Chill that had a bit of the space tourism aspect to it. There was no travel in it, but you did have a spaceship interior you could walk around and see a really nice earth background. The screenshots don't really do justice to that part.

Don't worry about not having money, lots of developers -- including myself -- just make their games for the sheer enjoyment of it. So that leaves you with just the programming obstacle and even that can be surmounted, especially if you pick a good game engine.