
I'm excited for the LD, I will probably be using Unity since I haven't had enough time to really iron out my workflow for any other engine I'm messing with.
Anyway for themes I like themes that have multiple interpretations, Some themes I see are often narrow leading to games with very similar ideas and I think that makes some of the rating phases for the past jams feel slow to get through, for me personally.
Maybe try looking at your theme suggestions and broaden them to allow new interpretations! Instead of "One Button Controls" try "Minimal Buttons" getting the idea across without getting 'um akshually' in the comments when you used 1 button and an analog stick which "doesn't really fit the theme". Or maybe how about instead of "Outer Space" try just "Space" which can have games about trying to find a parking space, not just games that have space ships!
Here's some interpretations for my themes, but I think there's definitely plenty of other ideas for!
Artifact - The obvious one that people go to are Ancient or magical Artifacts, but you can also have Artifacts as in a side effect like an artifact in a science experiment Finally maybe a game about Glitchy Video Artifacts?
Support - This could be physical support like holding something up, emotional support, maybe it's you play as the backup for a spy who's undercover supporting them? Maybe you're the healer in an MMO? You have to support the new hire during their job training.
Limits - This one is so broad and that's the benefit, it asks you to put guard rails, but not what rails to put. Maybe you limit the number of inputs, maybe you limit the number of towers in your tower defense, or maybe you limit the distance the player can travel in your game. There's so many things you can do, but the goal is to come up with some hard limit then make a game around that limit!