Worked on the demo some more, apologies for the long delay.
Additions include:
-Tutorial mission
-Walljumping for a speed boost
-Sliding to preserve momentum
-Tweaked enemy AI, they should be more aggressive now
-Reimplemented remote demolition charges in place of the frag grenades
-Adjusted weapon balance
-Adjusted map flow and geometry- there's an alternate path in the first mission from the bottom area now
-Leaning is more useful now
-Firing range added after completing the demo
-UI tweaks
-Added options to invert mouse aim on individual axis
-Accessibility options to add a reference crosshair in the center of the screen and adjust screenshake
-You can use the mouse wheel to scroll through weapons now
-Adjusted heartbeat sensor mechanics, now only visible in reflex mode, where they're always visible.
-Tweaked particle effects
And some other minor fixes. Thanks for taking the time to play my game!