Fun premise. The long jump feels good to use, although it's easy to overshoot it and fall off a platform.
The green text in the top right is sometimes hard to see based on what it's overlaying. Having an outline or text box would have helped.
Having a shadow below the player when they're in the air would have been nice for lining up jumps. Checkpoints for the last level would have been nice too; it's long enough that it gets frustrating when you fall halfway through and have to start over. Sound effects for hopping and jumping could have added a lot.