Hello! Yes, I think Spacescapes is only for windows. Alright, I will just mention at least the games that "could" enter in this challenge if I would have done them this month hahaha, so at least you can see, but don't take them as games to participate in this challenge for real.
The game I have made this month that I'm talking about is Hogwarts RPG, I just wanted to try to make a small-normal sized game that can last for a few hours in 2 weeks, and I did it successfully.
About short games, I have a few.
Spacescapes is one indeed, because this game was created mostly because the music, it's basically an ambient experience.
There is also The Lays of Alentë Unity Maps, but I think this one took a bit longer because I had to populate the terrain and I was very noob at this time. Still, this is very short.
Horroria is also a very short game but not sure if it could be applied to this challenge since the duration is not 10 minutes (although you can finish in 10 minutes I think, if you die hahahha)
And finally, the 2 that I think that meet more these requeriments are 2 minigames in Cosmorama. The big Cosmorama game was done much later, but if you enter that game and you scroll down, you will see that there are 2 small games additional to the big game. There is one that was done in 5 hours (challenge was to do it in 15 hours so I guess I did it very well lol) and it has a duration of around 5 minutes. The other is a simple 2D platformer that was also done very fast and the duration depends on your skills, but if you are good, you can also finish it very quick.
I was thinking in your challenge and I'm following you, and definitely, next year sometime I want to try to do 10 games in 10 days of 10m duration. I will plan them in advance, though hahahaha ideas, mechanics, story, whatever... I'll plan all before starting the challenge :D And if you do things like these every december, I will keep an eye on that. I love this kind of challenges, it motivates me to continue doing games (this month I developed a game after 1 year of non developing anything and I really missed it) and also it's a great way to increase the number of games in portfolio.
Sorry for long text but I got excited hahaha, thank you!