This is a cool RPG! fits well on the theme but there are some things that need to be fixed.
I think you used a 3D sound source, the music is good and relaxing but I can see is a 3D source because you can hear it panning on your headphones and if you stay away from the center, the volume turn down. I don't know if the 3D source is intentional or not.
Also, the skill takes too long to charge and become worse if you get stunned by multiple enemies (like the small ones and the mages that keep shooting you even on walls. I agree with the samah comment, to refund some charges after killing enemies. Also make the bug guys shoot get destroyed when hitting a wall, they can hit you from wall you can't see on the camera. Besides all these is a cool game and I think the art style is really cute and fits on the theme really well.