A simple yet entertaining game! Nicely put together, the only complaint I have is that it's a bit hard to know thjat I lost a life. a nice screenshake or red flash or even a simple UI "X" image appearing would've made it perfect!
Same can be applied to the countdown, I felt it would be better as a whole transparent sprite and have it count down instead of inside the text.
But overall, well done on art, sound and the whole gameplay experience, it functions well!