The fundamentals here are good! Feels nice to control. The level variety is about as good as it could be with the limited mechanics.
Small tip: Calibrate the volume of everything with master volume at a middle value. That way, if the game is too quiet for someone, they can turn it up. If you calibrate at max value, it can only get quieter.
The thing that stands out to me is that this game encourages you to speedrun, but doesn’t have anything in the way of routing. There’s a bit of risk-reward with mashing faster, but not enough to make it feel worthwhile to run through again for me.
It would be great to see more mechanics that allow showcasing skill, like timed spikes that pop up and down, or projectiles, or maybe two routes and the faster one is a lot trickier. You’ve got a really solid foundation, I’d love to see it expanded!