Is there an indication of what the button progression is? I got to level 2 I think but I would die out pretty quick since I would guess randomly out of the 8 buttons.
The idea of sequence breaking is pretty neat; have you considered swapping out lives with a timer? Then the player would get all of the chances they can to guess the right combos, but they would need to do it before the asteroid hits. You could even have a view of the asteroid moving towards earth at the top as a visual indicator (for the visually impaired mode, there could be a ticking sound that speeds up to indicate this).
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No indeed no indication in the progression, as I only had time to implement 8 levels in 1 week, I think the game would have been too simple. But for a next version with more levels it would be possible, like a visual mention of the approach of the asteroid, very good idea ! I voluntarily didn't put any sound design (timer or other) in the "blind" mode because I thought it would interfere with the sounds to identify to progress, but I'm waiting for some feedback from the players to move forward on this part of the project with pleasure :)