Game Dev Tycoon is amazing, my only issue with it though is the fact it is unrealistic. There's a system in place with algorithms that don't act at all like in real life. I made a smash hit RPG which scored 10.25 metacritic and 5 years later I bought it's sequel out on a much more advanced, 3D engine with loads of RPG features like open world, enhanced dialogue, realistic weather, char progression, dynamic world, radiant quests and so on with a much larger and better trained team with 50x the budget yet it scored like 6 metacritic and didn't sell as well.
It's like wtf...