Ahah, I love one button games :) I work in a video games school and this is one the projects that is given to students during their first year.
Anyway, good job on that. The concept works perfectly. It's fun. The difficulty is well scaled. You have a few interesting mechanics that allow you to create nice level design elements. Some of them are a bit underused, but it's ok, it's a jam and good LD takes an incredible amount of time and playtest.
Well done.