(I was going to ressurect the old post but it had tons of messages on
it and had turned into another discussion entirely :))
The game Im working on is a platformer that Ive tried to make similar
to Little Big Planet. You can run and jump and grab hold of things and
push and pull and swing on them. Have a look at it here:
http://boxycraft.wordpress.com/
Some of the hardest parts have been getting the characters to react
well to controls and physics and at the same time seeming "alive". Ive
got it the main part of it working but Im still tweaking it and fine
tuning.
Another challenging thing has been making "non-physics" items like
switches and motors and making them integrate well with the physics
part of the game.
Anyway thats me, and please show what you've been doing too!