Your game has a lot of potential! I liked the ideas, but unfortunately I got stuck right at the beginning. After getting the platforming ability, I managed to float to a large door but didn't know how to open it, and all the doors were locked in the same way.
Some improvements I noticed in this short gameplay:
Increasing the movement speed would probably help; the character felt quite slow.
Maybe reducing a little the momentum of the character, it feels like sliding sometimes.
The platform idea is really cool, but I think it ran out of energy and I didn't know where to get more to use again, so I couldn't explore much.
Make it a little clearer what you need to do to open the white doors, because I didn't understand (maybe I would have figured it out if I kept trying, but unfortunately I'm short on time).
Overall, the game has a lot of potential; I loved the idea of the mortar and the platform!