PID.. possibly one of the best platformers I've played... ever, definitely one of my all time favourites. This game is very original in its gameplay design, its just gorgeous to look at and faultless in its programming from the controls to the collision detection. The music and sound effects also are top quality and extremely well chosen for the various levels, suiting each situation perfectly.
Don't get me wrong, you will spend many a time shouting at your monitor/tv screen lol, its frustratingly difficult at parts but acheives being awesome at the exact same time lol.. not many games can do that. It also gets the brain working as you try to find the best way through some of the levels.
I was lucky enough to get this game for free as a giveaway one time but after playing through I kind of wish I had paid for it and hence given something to the developers.. so this is why I am going to make sure I buy this for at least 1 other friend as a gift, my way of giving something to the developers for such an amazing game, as a thank you to them.
If you haven't given this game a go yet then I urge you to get it now.. you won't regret it.