The retro graphics are joined by a pitch-perfect chiptune soundtrack that is catchy without ever becoming annoying. There are also hilarious (and surprisingly dark) cutscenes in between chapters, which had OXM in gales of laughter. And while you'll no doubt try to charge through the levels as quickly as possible, there are unlockable characters and secret warp levels to earn as well.
As if that wasn't enough, every time you get an A+ Grade time on a level, a twisted, nightmarish version is unlocked, complete with its own leaderboard. This may well be the best tenner you ever spend.