I finally managed to beat the Demo and wanted to give more feedback than in my first comment...
All weapons feel cool and flashy although some (coughRailguncough) feel stronger than other. Also the balance between stealth and action is often perfect! The variety of enemys is for a Demo great but maybe more "fleshy" ones coud help make other weapons better. (Although I can understand that in such sizes fleshy enemys are hard to introduce. Maybe something "Elemental" like?)The levels feel like a good introduction to the game with different terrains and objectives.I also like your unique mech design.
In my eyes this is already a great game with even greater potential. Maybe we will even get more mechs than the assault crawler? 11/10