This is ridiculously good.
I'd say that of which many before me have probably said...Fuck it. This game is so fun, but the nightmare boss is so hard it really just killed it for me. After about 10 hours put in to this game, 14 or 15 attempts at the boss, I realized that it was never gonna happen. I love that you had the balls to make that boss so hard, and the consequences for losing so harsh that many players would probably get so frustrated that they just quit. It wasn't the case with me, but when I first saw that I was losing all the hard work I put in, I thought was a lot of shit. Like I said though, it's a great idea, I'm glad you did it. You've got a lot of balls, and possibly too much balls if there's such a thing. Another problem I had was the dash ability was too easily activated. I can't think of a good solution, but there was many a time when I would go to move just a little bit, and would end up dashing to the nearest wall and losing some health and being knocked out. That was a little frustrating. I'm only giving this a 7 because although this game is fun to play, this shares many of the same problems other platformers share on major consoles, or even in flash format. I dig this game, I just see the same frustrations. I'm still gonna play the sequel, and as someone below me said, this game's medals were ridiculously hard to get. I only got maybe 6 or 7, and the 100% game completion would be a nice addition, but I only got 99.5% missing 2 codex entries. I assume that one was the black gems in the nightmare boss, but the one below the codex entry in codex is still unknown.
To sum this up. It's a great game, definitely worthy of all the recognition it's received and more. I hope that you as a gamer can see the problems I see, and at least take them into consideration in your next game. I hope this detailed review is helpful. I try to make this as informative as possible to other gamers, and to the author, himself. I'll see the next installment soon, I hope. But stay classy.