I pre-ordered this game after hearing some of the soundtrack and watching an interview with Craig (one of the developers) before it's release about how challenging the game would be. I was already an AVGN fan, the music sounded great, the game looked fun, and I'm always up for a good challenge. I would recommend the game for others like myself, but there's plenty of different gamers, so I'll try to elaborate to help you decide if you want to purchase it for yourself.
Music- The music in this game is by 'distant' and I enjoyed it so much that I actually purchased the soundtrack as soon as I saw it available. I still listen to it on my iPod. It's the kind of music that makes you want to keep playing the game until you reach your objective. I would recommend the music in this game to any type of gamer.
Control- Some of the funniest AVGN moments are when he makes fun of how bad the control is in a video game, but they played it smart when programming this game. Coming from someone who used an XBOX 360 controller to play the game on PC, I can say that the controls are well placed and very smooth. Once you understand what all of the buttons do, there's really hardly anything to complain about if you die, assuming everything runs smooth on your PC.
Graphics- Don't expect modern graphics here. This game was meant to look like the 2D sidescrollers that AVGN usually reviews. It seems to be a mix of 8 bit and 16 bit and it fits perfectly for the type of game this is. Unless graphics are the main reason you purchase a video game, these will do fine. They actually remind me of playing NES games growing up.
Fun- As an AVGN fan and someone who grew up playing these type of 2D sidescrollers, I really enjoyed the experience. There's some moments in the game that are from AVGN episodes that will make you laugh. If you grew up playing 2D sidescrollers but are not familiar with AVGN, a lot of things in the game will not make any sense to you. I don't know if this would ruin the game for you or make you interested in becoming familiar with AVGN.
Gameplay- As far as the enemies go, there are some that have the same pattern but just look different depending on which level you're on. This wasn't a problem for me, however, because the different level designs and number of different obstacles provided enough variety to keep the game from becoming boring. There's 8 main levels after the tutuorial that you can play in any order that you choose before unlocking the final level. There's 3 characters you can play as besides The Nerd if you find them. Each character has different movement and attacks which keeps things interesting. There's also some powerups scattered around each level, and a special gun upgrade that only The Nerd can use. Lots of the deaths in this game come from failing to pass obstacles rather than enemies. If you're impatient and are easily upset, you'll probably be frustrated from dying so much while you're learning the levels.
Challenge- Okay, this is probably the most important point in deciding if this game is for you. AVGN complains about how hard some of the games are that he reviews, but challenge is something I love. If you're a perfectionist, you better make sure that you're dedicated enough before you buy this, or you'll be very frustrated. The most difficult difficulty setting on this game is called YOLO. Unlocking this mode will be challenge enough for most gamers, but YOLO is when things get serious. If you have a bad heart, then you shouldn't even try this unless you're attempting to commit suicide. You can't get hit at all or it's game over. This means beating the tutorial level, the 8 main levels plus 8 bosses, and the final level plus the final boss without getting touched. All this must be done without saving. If you're not speedrunning or wasting time, it should take about 37-40 minutes to complete the game on YOLO. The best part is that the developers actually had the guts to make an achievement for beating YOLO. My heart never beated so fast in a video game as when I would make it to the final stage thinking about how if I get touched by anything that I have to go through another 35 minutes of perfection after all of the time I just spent only to get killed and start over. If you're dedicated and love challenges, this one's yours. Casual gamers will not be finishing this one.