More small demo changes

I made some small changes to smooth out the demo experience while also doing background stuff. The demo includes a new playable level, the Foam cave!

-tweaked the smooth camera to move differently when the character jumps -adjustments to cosy courier level to make it teach better, and to several levels to tweak annoying hitboxes -fixed some bugs in djinn's cave

I took some time making some trailers for events and recording/editing a gameplay video. I am currently working on some shroud for the worldmap, but it isn't implemented yet.

The game will be up in Steam Next Fest next week, I hope you'll give it a try. You can also do so right now, don't hesitate to wishlist if you like it! I'm always happy to get feedback.