Thank you for the list!
1. Good idea!
2. The off-screen squares seem to annoy a lot of players, so I will remove them if there will be a post-jam version of the game.
3. I think there's plenty of room for mistakes already.
4. I tried that but it felt weird... and also like a Playstation™ commercial ;)
5. Maybe I'll try that and see how it turns out someday.