Honestly, the tile mistakes are very minor. While playing, I only noticed one or two, considering I am focusing on not getting killed.
I honestly think the level sizes are perfect! The fact that they are large makes for a much more diverse level and allows for variation in gameplay. I'm glad the levels are big!
I should be able to get the next 5 parts or so finished by the end of next week. After this one, I think I'll try to tackle X-mas, and if I'm feeling adventurous, I'll do a let's try of the original (I have been struggling with the hard version of the graveyard level for about a week now, so I don't think I'd be able to finish it).
I'm glad you like the videos! Considering this is my first let's play, I was worried they wouldn't go well... I do hope to get batter as time goes on though!