Hey,
I really like your game, it's quite addictive.
The design is simple but very efficient. Aesthetically it looks good and "smooth".
One small complaint though, the sentence you hear at the beginning of the game is difficult to understand for me. I didn't understand it on the first playthrough. I'm not a native English speaker so maybe that's why, I don't know. It's nothing critical, but maybe subtitles to go with the sentence would be good.
Other than that, very pleasing experience ! :)