Yeh I do intend to optimize it as much as possible so it will be playable on any potato or toaster PC
Short of filling the game up with as many free models and 2k res textures and normal maps on things you'd barely look at, it should work fine. One game I'm doing makes use of a lot of physic rigidbody objects that can collide with eachother but will just have game settings that limit the amount that can be spawned in the level.
"minecraft and cs:go i don't know how to explain "
yeh neither of those games are known for high quality lighting and neither make use of normal mapping for textures.. csgo only a little bit for weapons but the levels are largely just using flat textures (Though if valve ever had CS with a real day/night cycle on the maps I'm sure that would change)
Pepsi I'll let you know, though right now I'm not doing any storylines or dialogue type stuff yet, I guess when I have some test game build out for you guys to play around with then we can talk about that sort of stuff.