Every-time I think something is "not good enough" I try and remember that it's okay for it not to be perfect. It will never be perfect that's an uncontrollable part of life and creating. The goal is to improve/learn new skills and make something from my heart. It's okay if it flops, it's okay to keep reworking it and adding new versions. The most important part is to keep making the effort and doing something. (I lose focus and struggle most with this aspect)
I feel like our entire school lives and growing up we had to aim for "As" or a certain level of perfection or correctness. That was so damaging to me!I am trying to reprogram myself not to think in this way because I think it's extremely harmful to be so focused on result and forgetting that the process of creating and learning on the way is equally important.
Some people in this thread suggested looking at terrible unskilled people making games to make you feel better- while I can't disagree with that advice I suggest rather than looking down on them to make yourself feel more important (this isn't a healthy mindset, you will think the opposite when you see someone better!) I think you look up to them. Look at them making one heck of an effort. How can I power through it and be like that? Is what I think.
I think being self critical is super powerful if you can use it to boost yourself not tear yourself down. Sounds like you are good at finding areas you need to improve!!! That's an awesome talent, use it!!!! BUT you need to separate critique of your work, from critique to yourself. Think strategically and objectively. I go to art school and I see others struggle all the time with this. They identify and are emotionally attached to their work and get upset when it comes to comments or critique. My poor art teachers walk on eggshells and I have to tell them upfront I welcome all comments and thoughts towards my work and wont take it personally haha. I try to feel the same towards my own thoughts and comments positive or negative. I would say most creators struggle or are struggling with this too! All your feelings are very normal and I have them too.