Hello am looking for job, i can do that style samples you posted, am interested on your offer here is my general art portfolio https://www.artstation.com/cat_pawns
sorry for necro this thread but, stardew valley is very data driven, most thing changes when you go to sleep, and also very modular like the farm being his own world apart from town, and the mines its a complete new game where you are there to fight. about the engine any 2d renderer do the work just fine it doesnt matter the game its not hard demanding on resources.
Hello i like your project i have some experience of c++ and c# so i can bring a hand in the code side, also i have some drawings skills! i have a pen tablet so i can make digital art for things like resources , ui etc... if you are interested contact me. I think a 2d cartonish style can fit perfectly the game.