I like how the music/visuals change the more stressed you are! It's a cool concept in general.
One thing that I think might be improved is the UX. Somehow it doesn't feel natural to use. For some actions you need the mouse, and for others - the keyboard. Perhaps it would be better to make everything keyboard controllable? Or maybe change the ratio so that one needs to press more keys on the KB and click fewer things with mouse? Right now I feel like I'd be faster if I can just use the keyboard, and that the constant switch between mouse and kb, as well as some animations are slowing me down. This raises my IRL stress! :D