Absolutely you can :)
In the 3 jams (ik it's not a lot) I've done it solo and it worked out just fine, and in those jams there was only about 5 days, but in this jam there's a whole month to make a game.
The background is literally from when I first started developing the game lol
When I was adding the king mouse, I kinda forgot about the theme. when I realized it, I had already added it to that game AND it was 8 hours before the deadline.
(Also sorry for taking so long to respond, I saw your comment but forgot to reply)