Hello Birbvent, congratulations on completing the 250 box challenge. Here are my thoughts

-right from get go boxes seem pretty solid, line weight is used properly and hatching is executed correctly

-at times you'll attempt to correct lines, don't do this

-don't go over your original lines when checking their convergences, this makes it much harder to evaluate line quality

-you show some struggle with the inner corner, which reduces with later boxes, but you should still keep this in mind.

Conclusion: Overall a very solid submission you clearly demonstrate an understanding of the core concepts. I am more than gladly marking this submission as complete

Best of luck moving forward

-Slyx