Hopefully there's an engine out there with a good balance of both Godot's and Unity's pros, and that matches your taste! It's quite resourceful of you to try out as many as you can, instead of dealing with just one that doesn't always work for you.
Take as much time as you need on your game! A game that spends several years being thought out and planned is bound to do better than a rushed one. Your old graphics look really cool by the way; The minimalism works!
I stayed quite minimalistic with the pixel art in my game as well. I didn't want to add much detail at all to solidify the retro look, but maybe I can add more in future releases.
What kind of game is it? Mine is an RPG!