I think the core concept is solid and has a proven track record of having interesting game play via adjacent games like Rocket League. However, here's my thoughts on how to improve it
- I would change the camera from a isometric perspective angle to a top-down (either perspective or orthographic) so it's not as hard to judge depth.
- I would change the arena to something symmetrical to make sure it's an even playground for both players and simpler to focus on the core gameplay before exploring more elaborate arenas.
- I would round out the corners in the arena if you have them to prevent instances of getting the puck stuck in a corner.
- I would create a greater number of dynamic powerups that spawn an equal distance from both players to present some risk-reward decisions for the players.
Hope that's helpful.