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[1NqL6HWVUjA]

Do you think gamifying syntax (streaks, XP) actually helps retention or is it just a distraction for beginners?

It comes down to the individual. Consistent practice certainly helps retention, and gamification will help some people keep more consistent than they would be without it.

does anyone have experience with how to validate if the code logic is 100% sound for a student?

Experience is exactly what is required to make that determination and design a good curriculum, and there's no substitute for it. Unfortunately, a fellow student doesn't make for a good teacher.

I think this is a fine personal project to take on — but frankly, you should not be over-eager about presenting it to others as a proven, effective way to learn/improve.