Game Concept is awesome, reminds me of armored core and chrome hounds.
I am really interested in seeing where you take this game and you appear to already have a really fun foundation. The sound effects are excellent, although the boost could maybe use a volume increase. Enemies so far are fun to fight and offer different challenges. Visual design is impeccable.
I do have a few questions about your future plans for the game
Do you plan to have multiple mech types or just the one for the player to control?
Are there plans to have some form of progression in terms of unlocks?
Might we see boss type enemies such as rival pilots or near peer enemies (1v1, 1v2 style missions)?
Lastly, not a question but I think indirect fire weapons like an artillery gun that allows shooting at long distance over buildings would be awesome, such as an upscaled version of the current HE grenade with its own drawbacks obviously. Both as a weapon for the player and an enemy type.
I know developing games is not as simple as to permit scope and design plan changes on a whim but if anything I just think these things would be great additions the already solid game you have managed to put together. Regardless great work on the demo.