I got 550 on hard.
Very decent game from the technical point of view. You got the animations, the SFX, and the platforming, all working well.
A few tiny bits of critique:
1) the massive music player in the center of the screen feels completely unnecessary
2) The health bar is misleading - despite having 3 health you can take only 2 shots. It would be cool if at 1 hp you could shoot, fall down due to lack of health, and then revive if you hit the enemy :)
Last but not the least, did you make all that background music? I could not find any credits nor a license statement, so I was wondering if you made it all yourself?