I played to 11k score.
UI Issues:
When playing, every thing was squashed horizontally. The score was hard to read and the nukes were ovals. I and the nukes was also able to go below the screen. I was playing on mobile though, so this is not going to change my rating, as I don't think it was made for mobile.
Gameplay:
Simple gameplay, but it became too simple. The difficulty did not increase, causing me to leave out of boredom instead of challenge. This is the number 1 thing to fix to encourage addictive replaying. Even just adding speed can help. The top seemed to be much safer than the bottom. I agree with the improvements from Bitboy Games.

