You could always make something small and silly! You have a lot of time. There are no winners in mini game jams, but having the mods play what you made on stream is the prize!
The mods play everyone’s games on their stream at the end of the month. They stream on Twitch at MSMakeCode and also on YouTube on the Microsoft Makecode channel. You can also watch back the stream on there if you can’t make it live!
Sometimes I just send in whatever I have that kinda fits the theme, and I would encourage everyone who doesn’t have the time to make a full game at least make something small!
Edit:
@Big_Mac_Muncher they will probably even play your project, just not for very long, even though you put SOOO much effort into it 