I'm not a very experienced player, so take my takes with a graint of salt.
Love the character, very charming. Love the way she moves, but I kinda wish there's some kind of way to control her speed, but I understand if it's a design choice to just rely on momentum to control her speed.
The demo was pretty fun, but I felt like I was fighting the camera the whole time. I don't know how hard it would be to do it, but I would sugest to make some kind of dynamic camera.
Sometimes, was easy to get blindspots on the platforms and fall because the way the level was designed with the free camera.
The grappling hook parts where specially dificult. Several times I would lost momentum while trying to adjust the camera and couldn't take higher jump. Also, several times I swear I did the grappling hook input but it didn't register.
There was a bug, where if I changed to another window, and get back to the game, the jump button would work once and stop working. Any other action/command would work fine, except the jump button that would work only once. Respawning fixed the issue.