In terms of vocal quality I think I might call this Len’s best! The creator did a really great job of making him sound as close to human as possible, with the wavering vocals in a lot of places and stuff!
It’s easy to sing along to this without having to stop and think “Wait, how would a non-robot sing this part?”
It also has that nostalgic ’90s anime song feel to me, which I really like. :’D