I like the concept and the fact that the game is infinite. The timer makes everything more challenging and each time I play again, I want to beat my high score. I like that the game is playble with a controller. I tried to play with the keyboard but the player's movement is more limited.
The game could have a tutorial or a "how to play" tab to teach the controls to the player. When I started playing, I didn't know how to attack so I pressed all of the keys on my keyboard to find out the right one.
The game is simple but fun.
Good work!