I'm also a bit late to the party, but here we go. I'm about the make my first public game (...prototype probably), if we don't count a doodle I've created back in 7th grade in The Games Factory. I'm 33.
After the jam theme was announced, I tried to casually come up with ideas and bounce a few off of my friend Tibor. Yesterday morning I've received an email that there's only about a week left, so I finally decided that I'm going to make an experimental 2D side-scrolling platformer game in Construct 3, in which the gravity is only constant in a meaning that it's constantly changing. In other words the player has to quickly adapt to gradual changes between moving the "player" (which is actually a ball of some sorts) on the ground, in (near) zero gravity or on the ceiling. Since I'm super bad at graphics, I'll be cooking with pre-made assets by the very talented Rotting Pixels.
My main inspirations on this project are VVVVVV (the best retro-style platformer of all time IMHO), Rollin (the amazing DOS game, although it's top-down 2D, I loved the level design and the item/shop mechanics) and Ballance (if I have time, I'll try to nick implement its paper-wood-rock material changing mechanic).
The player will have to avoid hazards and pick stuff up to complete levels. I'm still experimenting with power-ups at the moment, which will allow the player to lock the level of gravity temporarily or set it to a certain level ("normal", zero, upside-down; or -10, 0 and 10 in Construct 3 terms).
At this point in time the "game" looks like this (please don't mind the super ugly gravity gauge in the bottom right, it's only temporary):
Once the basic power-ups are working, I'll upload a playable level and humbly ask for your kind feedback. By that I mean that it'd be very kind of you to provide any feedback. Its content does not have to be kind ;)