Haha, we used Bevy for this exact limitation.
It was definitely more difficult than something like Godot or even MonoGame for a jam with such limited time.
But sometimes you just need an excuse to do something stupid, and we plan on using this game to play around with the engine some more. Sometimes a small, quick project like this can turn into something more.
It's just a Game Jam, we didn't take it too seriously.