I like it! I never would've thought to put mechs in a medieval fantasy setting, but somehow you managed to make it work in such a cool way! I also like how the 2.5D-ish intro menu looked.
I feel like it was difficult to attack the dragons during gameplay since the bullets would lock onto my character until I let go of the mouse. I also felt like the dragons would fly too fast and my projectiles shot too slowly, so I never felt like I was able to properly hit anything. I feel like, in future games, it might be good to have the projectiles move at the same speed, if not faster than the target.
But otherwise, really cool game! I like the concept a lot and I can tell you cared a lot about this project, and I'm excited to see what you'll come up with in the future!