Want to get familiar with Python Pygame library (like I did)? Then check this "2d Space Invaders game clone" out! Pygame hides many of the down and dirty implementation details and all you're basically left to do is create the game logic. If you want to do something similar this project will surely help you.
KeyC0de's take on the classic Snake game he played back in the day on Nokia 3310 and Sony Ericsson W810i.
If you'd like some implementation help on how I went about to do this I hereby give you my notes below:
A minimal but functional tile-based 2d game the likes of the good ol' Pokemon Gen 2. This was my first real big accomplishment in my video game learning journey. I was inspired by Pokemon Crystal, which was the game that really introduced me into video games.