Alright, the new update is out. You should now be able to switch between Gamepad + Gamepad or mouse / KB + Gamepad. The hot air balloon should also be fixed now. There are a bunch of new hats and glasses types with special skins. These can be either unlocked by collecting cat bells strewn around the levels or found in the levels themselves.
You'll have to reset saved game data which can be done when the game pops up a new menu option at the start of the game (this should not be common thing and only has to do when I add new variables to the save-game system).
A key-binding system is next on the list but I hope at least that this suffices for now.