We've been working away on tightening up Really Big Sky's performance for a lot of users. We found the cause of the most common performance issue and totally crushed it! Go into the Options screen and disable the Performance Graph if you're having slowdown issues :)
We've also added customisable controls for both keyboard and controllers, increased the range of compatibility with non-Microsoft controllers.
Additionally there are new tracks from our resident musicians, rebalancing of some modes (in a good way, no nerfs!), boss kills now increase your multiplier.
Have you fixed the bug forcing keyboard+mouse control for the 1st player? I'm unable to use a gamepad because of this. The gamepad is added for the 4th player when I try to use it :-(. (it's a Logitech F710 in xinput mode so it's basically an xbox gamepad)