Simple but very well done. I liked how each level was basically a puzzle, and that after solving each, the execution was relatively simple. There are a number of levels with traps clearly designed to make you jump without realising, I found that pretty entertaining. I think that the "insta-death on any mistake" mechanic worked because of there only being 15 levels, but with more than that I would find it frustrating. Maybe it would be good to have some indication of how close to the end you are, so that you don't give up after losing on level 11-15?
In a full-fledged version of this game outside of the jam's theme, I could imagine your battery holding more than one charge to allow for larger levels. Otherwise the bouncy enemies in a lot of the levels basically act like an extra jump anyway.
Great job! :)