Almost all hits i would take would be when the controls just got jumbled and i have to find what key does what as it would really mess with my brain and confuse me so much xD Simple yet nice to play, cool music and art.
I feel like the game speed should increase with how much ship you destroyed rather than only with time - not because of the original space invaders - but because the game is very easy if you can manage to destroy the ship early on, while if you take too much time and still have lots of ships alive it becomes impossible to survive.