I had a great time playing this game! The controls are simple to get used to quickly, the graphics were clear and nice to look at, and it was really cool hearing original music and sound effects.
I've heard other people in the comments say this is a "rage game" that was intentionally designed to be frustrating, but I don't think that was the case at all; all of the levels had straightforward designs that I immediately understood how to navigate, so I actually thought it was pretty easy. I do think it would be nice to include a few more checkpoints, though, especially because the stalactites don't respawn, so some rooms are emptier after you go through them the first time.
To give the game some extra polish, I'd suggest adding some sound effects for bouncing on a springy platform and collecting a star (since you do those often). Also, recoloring the electric traps to be darker or less visible when their sound is off would make it more clear that they can't harm you in that state. Finally, since the game is about collecting stars, I'd love to see a count of how many stars in the game you collected on the end screen.
Overall, this is excellent for just a month of development time, and I can't wait to see what you can make in the future!