Thank you for playing and giving feedback!
The movement in the game deliberately has pretty high inertia and low friction, but this is something i'm open to changing and adjusting if it makes the game feel better to play. As for the aerial movements, the right-click boost is very ... "physics-ey" so to speak, and so the player's prior velocity affects their trajectory afterwards.
A lot of these decisions were made because muh pvp skillcap. I might add an upgrade that augments these things (inertia, friction) to make movement feel tighter.