I think this really needs some difficulty scaling - I couldn’t properly understand the concept because the time of each round was up so fast. By the time I understood, it almost got a little too easy. Part of the learning curve for me was also that I kept trying to hit X instead of S because the game felt like it prompts me to use keys in a cross shape instead of exactly WASD. Finally, displaying the score in the end screen would be a nice touch to encourage sharing and pushing further :)
Cute and reasonably fun with just the bare minimum gameplay mechanics - interesting game entry for sure!