Overall, I really liked the demo! All the movement felt like it had great potential to be used in a variety of ways across levels! All I'd suggest is..
1.)Adding a short roll that can be done on the ground by using the dive button and increasing Goobi's acceleration speed a little bit. I have no major problems with the movement speed, I'd just like to be able to get to that speed a little bit quicker.
2.)Possibly making the glide button the same as the jump button while midair (and maybe setting both triggers to be dive buttons?) I think these might help the controls be easier to grasp and use for beginners.
These are just some ideas I thought I'd suggest, I by no means have any major background in game design, but I do think they could help the movement feel better.
Keep doing what you're doing though, I love the game so far and I look forward to seeing what's next for this robo-mailman!