wonderful game jam idea, could easily see this expanded into a fully fleshed out game.
My only critique is that I would have you dash in the direction of the mouse instead of away, since the normal movement is in the direction of the mouse. Because you have the bullet time effect, this isn't the biggest problem, but for people who like translating thought to action as fast as possible, having move + dash require not just two separate mouse buttons but mouse positions as well is a bit flow-breaking.