not sure yet, my first thought is puzzle type stuff, I'm thinking shrinking and enlarging like an Alice in wonderland type of thing. Best of luck on your jam! I'm glad you figured something out and I'm curious as to what you came up with so I guess we'll see soon enough :P
I think emphasize both parts of the theme equally if you can. Size and Matters. Make sure that if you have objects changing size, that it actually matters. To what extent it 'matters' is entirely subjective but hey thats part of the fun! Happy jammin!
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Sounds great, i also thought about that, but changed my mind after trying to develop the mechanics in my head. I am kind of stuck too, due to homework and my f-up sleep schedule, i've decided to cut content from the game in order to release it in time for the jam, i hope people still like it, its a pretty simple game but i think it'll be fun to play at least one time.