Things i don't quite understand about the game

two things I don’t understand in the game. building those game engines. doe it mean you are upgrading one and making it better or are you creating different ones with different attributes?

question two: experience gained. I don’t understand the bar graphs and points for each component of development. what do they all mean?

When creating a new game engine, you always want to have AT LEAST 2 or 3 new additions to it, otherwise it’s a waste of money. The experience gained at the completion of each game will level up your stats, and after a couple levels of each stat it will unlock new engine parts. Hope I answered your questions.

Not entirely. It’s great for acquiring research points.

Well that would be later on down the line when you have money to spare, not when you’re beginning.