That loading bar effect is sick! For a first jam, think this is definitely a success!
When it comes to 3D platforms, it's always hard to do precise jumps when the camera is fixed. Maybe having the ability to do fixed rotation could help a bit if you're committed to the current camera angle (like by pressing Q or E, the camera shifts 90 degrees).
If you do keep up with this project, it would be awesome to see if you can come up with designs and integration for other concepts that we associate with downloading and loading things. Maybe the download bar gets really fast at the beginning and then when it hits 90%, it slows down to make that last jump stressful.
Good stuff regardless!