Crash when creating an event for custom families. Default families work fine, but user-created ones crash.
Also, the Platform attribute makes the sides of a platform solid as well as the top. Should only be the top that's solid... if you jump at it at an angle and hit the side you slide up and around it, which looks a little (very) odd.
Also the default "Move Down" control makes you drop through Platforms... not too handy in games with ducking. Perhaps a toggle for that somewhere...?
The offset for tiled backgrounds is SWEET. That'll make for some good effects
. Needs a "Get offset" expression though, I think. Also loving the moving platforms thing... made some crazy ones with Sine behavior