Sound was a bit annoying, graphics were pretty inconsistent, it was hard to tell what was background and what was platforms, I didn't understand what the controls were for a while, and it was hard to read the store prices, but the use of slowdown was immaculately used! With that alone, I can tell that, with enough elbow grease, you could definitely see turn this core gameplay into something super addictive!
My submission is also in Pygame, if you want to check it out and rate it!
Also, for future reference, try using pyinstaller to convert .py files into executable files that can run .py files even if the user doesn't have Python installed (but note that the executable file that it makes is determined by the operating system of your computer, i.e. if you're on Windows, it'll make .exe files. If you're on Mac, it'll make whatever is the Mac equivalent)