Thank you for playing and for your feedback. I'll make sure to check out your game and comment soon. :)
As for the colors part our goal was to make those paint buckets on the stage interactable and capable of dying the parts on the table at the expense of some of your earned points/currency. Instead of adding more parts anytime a part goes through the conveyor belt it would have a chance of being one of its colored variants otherwise you'd have to wait too long to see a part you need.
But the art was definitely something that held us back as this was my partner and I's first time doing pixel art for a game. I agree we definitely need to make the parts more distinct if we continue with it which I think we will.