To accompany the fast-paced puzzle platform action, there's an absolutely great soundtrack by Souleye bleepy 'chiptune' music that will keep you tapping no matter how hard it gets! And VVVVVVV does get hard, which may put some players off. While some of the rooms are almost malicious in their design, it's really rewarding to complete them.
Death is common, but lives are unlimited and there are checkpoints in most rooms. It's a lot of fun learning a new way of thinking your way through a platform game, and the puzzles are combined with the need for some pretty fast reactions. Much like Valve's Portal, gravity is the key to puzzles in VVVVVV.