I didn't understand the opening. You are greeted with a strange name enter screen (or something?) that isn't implemented yet, and have to click around randomly to get to the actual game. I think this should have been removed for the demo. This starts an intro sequence that does not really act as a tutorial as you would expect it to. You have to jump into a wall that actually has a door in it that you can't see in any way.
When the game actually started I got immediately frustrated. I get that this is probably the point, as the game is clearly built to be a rage platformer such as getting over it, but I think the difficulty hit too hard too fast. You are immediately tasked with hitting a relatively small button to open a door and I quickly gave up after this section.
The level design should ease you into the bouncing mechanics. The player's turning also needs fine tuning, you should always feel like you are completely in control. Turning a little too hard and face planting on the floor feels bad.
Overall the graphics are fine, but there's some serious mixels and rixels. Zooming into the characters during text boxes looks weird as does zooming out. The player character does not scale or rotate well, I would focus on improving how the player sprite looks when it's manipulated in this way.