It's a really fun game and is very well designed. However, I often have issues with the blue feather power up. I collect it but it doesn't actually work or do anything so I die if I hit a rock when I should float over it. Furthermore, occasionally I have an issue where I suddenly cannot make the character jump any more. I can pause the game, die and restart it, but I can't make the character jump unless I close the game and restart it. If these issues get fixed I will give it 5 stars