I really like the movement system, that i can glide up walls or fly like jetpack. I give me a feeling of freedom when moving around the city. The bonus race minigame take benefit of this mechanic and I feel enjoyable. It has some minor flaw, like the camera movement is distracting, or sometimes when i jump-glide opposite building and lose track of the gravity direction, but i think it's easy to fix.
For the battle system. I am not sure the lock+attack mechanic is comfortable for me, probaby because i am using mouse instead of game controller. I feel the enemy has too much hp that it makes the game lose its momentum. And the slo-mo camera shot is too frequent. It's great if the enemy is boss or mini-boss. But it's slowing down the game when every enemy has it.
Overall, I like the sandbox idea.