Tutorial has been added if you've played the earliest demos, and controls are different.
New mechanics have been added compared to later demos (some added to tutorial). Shooting, movement and platforming should feel better.
There's a new weapon to try out (hidden at the start of stage 1).
Sadly no new stages (unless you really want, then type GEDG on the title screen).
Thanks for all the feedback last time. I managed to get my shit together thanks to that, but there are a few points I didn't address yet, like multi monitor support or shell rendering fix.