Good game, for the sake of simplicity I will put what I liked and what I think is still missing.
The good parts:
1. The game looks good
2. The game works well
3. Existence of an audio feedback (the sound of the timer when the round is over).
The bad parts about it:
1.Lack of background music (makes the game quite boring).
2. The icons for which options you have chosen are not displayed (that is, you press the keys which options you have chosen but it does not tell you what they are).
3. Maybe a main menu would be good, maybe because you can add a short tutorial there and you can display more things from there. (the part with the tutorial is optional considering that a tutorial is already in the game description).