Cool little game ! there's not a lot of controls that you can manipulate (only A and D, right ? I didn't find any use for W and S), and you don't need to tap the keys to add difficulty, so it's very fun but quickly you get the thing going, maybe there should be one or two more mechanics (I know a week is not a long time so congrats for making this, but for the future maybe ?)
Other than that, you have the score count, good animations and graphics, music is cool, a veeeery clear and cool and smart way to show the health (I think), it really "flows" how you understand the game. Short and simple, but very good !