Why not to vote on these 2 themes IMHO(no hard feelings):

• Your health bar is more than just a health bar - if you don't jump around it with clever tricks, it assumes that your game has a health bar element in it, it's good when theme is limiting what you can do but not cool if theme is limiting the genre or enforces you to add a gameplay element/mechanic to a game that might not need it at all.

• Every input does 2 things - I believe I have participated in such a jam and resulting games aren't fun, most of the time they are just confusing for people and have clunky controls, it's already hard to make controls fluid in the game jam without this restriction. Our brains aren't intended to work in that way and the theme is basically too limiting, you can throw out most of the genres you have in games just because of this. (Take into account that your game is going to be played probably no more than 2-5min - which gives you relatively small time to explain the controls to the user while also making user think a lot and remember new information.)