Frankly, a lot of native English speakers get the difference between "die" and "dice" wrong, until they're informed otherwise directly, so I really don't blame you for that.
The movement on the ground was fine, and I think the issue with the movement in the air was more about the hitbox interactions, looking back on it; that would definitely make me feel they're stiff and unresponsive if there's more blocks where there were hitboxes that you collided with that wasn't meant to be there.
I do think that there's a lot of promise here, and I think you could do a lot of neat stuff. Looking forward to what you do next.