Managed to get a perfect 300 score, don't know if it a lot. Some suggestions would be to try and keep the pixel count consistent for all the assets, for example if you want to use a hand that's twice as big as the character you have to draw it with twice the pixels, keep everything relative in size.
Also my character movement was way to fast so I suspect you didn't use Time.deltaTime in your movement script. Liked the theme and was an enjoyable experience.