I love how clean and simple the design is, the phone as a menu that leads right into the story is a really nice idea. The vibe is super cute and there are a lot of nice visual touches like the parallax background and the color choices and outlines in the foreground to make it pop out. Also the squash and stretch on the jump animation is a good touch and fits the aesthetic really well. I think the feel could be improved, at least for me, with a bit weightier jump that drops you faster after the apex, and a jump buffer (or increasing the time of the jump buffer if there is one) since so many quick sequences of jumps are necessary.
All that said I'd be excited to play again even without those changes if there were a couple more levels and some end-level cutscene images or animations. Really nice job, especially with the late start you got!