What engine does it use? Can you make it run on Linux?

As the title says, I've earned multiple achievements in the game at this point judging by what the game says the requirements for said achievements are, yet none of them have registered. In addition, I've found several incidents where barely touching a barrel or a sheep, causes me to get a Game Over....

at some point in the second level i turned a corner and the character was stuck in the middle of the platform(i was running through the grass with no collision). It also didnt allow me to turn at all and make you run straight until you fall to your death....

I was just wondering if you could add the ability to view leaderboards? I know that you can view your personal best and the top time after you beat each level, but could you also include the ability to view all the times (and when I say all I mean everyone's times) from the menu or on the achievements page here? Thanks and thanks for a great game!...

whenever i open the game the screen just stay black past the first loading and never start, tryed to verify game files, tryed reinstalling but its still doing that.