(Restrictions help to move on, discover something new and self-actualize in a non-standard form. Perhaps you will find new friends or future colleagues in the process of creating the game, which will help you not feel lonely and abandoned by everyone. Also, working on such a project will help you develop in the field that you like. Such competitions help developers to finally create something complete and of some value. Also, don't worry about the ratings, if even one person liked your game, then congratulations, you have found your audience, which will grow and grow over time! By the way, plus one project in the portfolio).
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You can create a game on any game engine (unity, godot, unreal engine, game maker, and others) or just write a game in any programming language. You can create a game alone or as a team. Basic requirements for the game: the graphics should preferably be black and white, the game should use the jam theme, it is desirable that your game can be played in the browser. You can also create a game in any language.
*Transparency should be implemented at the engine/code level.
You can not use alpha in your art files, but you are allowed to change the alpha when the game is running to create effects like fades, trails and ghosts.
**5 - if there are only two colors in the game(black and white or their analogues), 4-if there are three colors in the game, 3 - four colors, 2-five colors, 1-more than five colors. (The same color with different alpha channels is not considered separate colors.)