Just finished the video and oh. my. goodness. Thank you so much! When you were talking about doing videos for each game I thought maybe you'd do a 5 minute summary of each and you absolutely demolished those expectations. The feedback is detailed and understandable and most importantly, useful.
I don't have any plans to do an overhaul of the game mechanics (t-spins, etc) anytime soon, but I'm definitely going to implement some of the visual and score-based modifications you recommended like adding a grid, a next-piece-preview, and a combo counter.
It's obvious you put a lot of time and effort into this video review. Keep up the good work!