Leaderboards

So been working on the game recently, realised that there was no way of tracking progress so i've put a simple high score system in there. This could be updated one day to have an actual leaderboard but that is waaay off in the future for now. 

Also done some bug fixes, and added a small tutorial too. There's still the occasional problem of having a tree block the cave entrance, but that's what you get for using random generation for your levels. 

There's still more to be added yet, but good progress is being made, I think the next thing I work on will be adding in some audio just to give it an extra bit of feel while you're flying about.