This is a very simple platformer I built in 5 days to learn some basics and get practice in making frame based games. While it is mechanically simple, there are a lot of precise jumps and techniques you can use to shave off time and an in game timer that ticks up a second for every 45th frame (the game plays fixed at 45fps) and I had a lot of fun trying to get the lowest time I could. I ended up settling on a 2:27 for my best time but I'm sure that it could go a good bit lower. All of the artwork other than the player character was made by me in Aseprite, the player character is from the Python Arcade libraries built in assets.
Click on the practice_platformer.rar filename, and then in the upper right of the file information box hit download, and then decompress it. Then you can make a shortcut of the practice_platformer.exe file in the practice_platofrmer folder you decompressed and put it where ever you like and launch the program with it.
If when you run the .exe it blinks open and close instantly, it tried to open and saw you didn't have appropriate system requirements and closed before bogging down your machine.
The A and D keys move your character left and right, SPACE key jumps, W and S move you up and down on a ladder, R resets the current stage without resetting the timer, L completely resets the game to level 1 with 0 seconds on the timer, escape key closes the application, and F toggles fullscreen. I hope you have fun with it!
I've had trouble with pyinstaller being detected as virus software when using --onefile to package everything into a single .exe file for user simplicity, so I've had to create build folders/files. It's less convenient but I've compressed them so you can download it as one .rar. Sorry for the inconvenience!