Not bad for a first game! It even has keybindings. My primary suggestion is to always grind on platforms. Getting on a platform is already difficult and then you have to remember to press a button. I think that would make it more intuitive to play. Also I'm not sure if the level is randomly generated or static. I couldn't get very far sadly.
I noticed the 'Final update' message, so perhaps you moved on to other projects. So my suggestion may be irrelevant.