Very fun and polished game, I love that you had the game start immediately after death so I could get right back into the action to improve my score.
One issue I have is that the enemies often felt like they could be jumped over but it was never the case (due to their up/down motion). I think the game would feel more fun if you were actually able to hop over (makes you feel more dynamic since you're using the jump for more than just platforming).
I tried my best and played for 15-20 minutes or so and got 7200 as my highest score :)