The website Repl.it is hosting a game jam with a 1 Bitcoin prize! It ends April 18, 2019 at 11:59 PM PST.
You must use their Repl.it environment to code your game. You can choose from languages and frameworks like JavaScript with Phaser, Python with Pygame or Pyglet, Java with Swing, LOVE2D, Tkinter, and p5.js. Read more about it and find some starter tutorials at https://repl.it/talk/challenge/Were-hosting-a-Game-Jam/11432.