Gave this demo a shot and ran into a bunch of interesting technical issues during play, including graphics corruption and what appeared to be drift or lossiness on mouse sensitivity. The graphics corruption was similar to what I encountered when attempting to play No Man's Sky, so it may simply be that my 750ti can't handle what your game is trying to do.
I definitely prefer tight controls and high responsiveness when piloting vehicles in games, so the somewhat sluggish mech controls for this game were out of my comfort zone. The hover at the top of the jump feels good though and I'm glad that it activates at the top automatically.
I got beat up on the first map and wasn't able to defeat the enemies that were present. I'm not sure if this is because I'm bad or if it's because all of the graphics were starting to break down or if it's a little bit of both.
Left mouse firing weapon on right side of the mech feels very weird- I'd recommend adding a setting in the options menu to invert weapon pickups so that left click fires left gun.
One of the weapons I picked up appears to not do anything. Unsure if that's intended. I didn't find myself using the sprint at all and I have no idea what fortress mode is supposed to do. All enemies seemed to be continuously pathing directly to my location.
Lots of hiccups and performance drops as things were loaded. Loading screens should probably have the word "Loading" on them somewhere. The music seems nice.
Overall it feels like a good starting point; still very rough- but that's what demo day is for. I would focus efforts on refining player input - from the mouse sensitivity and camera responsiveness to the different ways left and right click are handled (I can hold left click to keep firing, but that doesn't work for right click, etc).
Full playthrough video here:
Cheers