I like the extensive options, however there was multiple problems when trying to configure them: master volume slider doesnt seem to be doing anything, and the other sliders both seemed to control the music despite the music/effects names. Also when rebinding my weapon buttons it then only allows you to click on buttons with that new key which was very confusing especially when I didn't know what was happening at first. Same thing with the weapon2 bind.
As for the gameplay: particles were awesome, visually very appealing. I like the concept of requiring weapon switches, however the weapons (especially weapon1) felt to run out quite fast.
Also didn't feel incredibly challenging, however the ranking system helps with that, but for the boss I pretty much just sat in the middle and took no damage.
Overall great soundtrack great art and great idea! Great job!!