Great stuff! - 3D in GMS, nice! - I found the default mouse sensitivity waaaaay too high, so ended up using QOAP-SPACE, but definitely feel like it would be easier to control via mouse if it way much less sensitive...
I feel it would definitely benefit from adding a sensitivity option to scale the mouse input, but as it is, it's fun, SILKY smooth, and reminds me of a cross between Star Wars and Star Fox - great stuff!