Very interesting game, I did like the art style but maybe some music to create a more immersive atmosphere? Over all it was fun and I didn't even realize there were missions since I was just exploring everything :D
I don't know if you've heard of Game Development World Championship before (gdwc2019) but it's a competition for indie game developers where they can submit their games and it's free! It's great if you want some more visibility for the game and it only takes a couple of minutes to join :)