I mean, there's no twist that make it a 2012 game with a 1990 look, it's simply a 1990 game. May be I haven't found that something special, if it exists, I wish to know.
that's true, but even in the nineties there were dozens of games which ones suffered from bad level/game design, and despite some hiccups, this game does it well, and definitely worth a couple of bucks, at least for me.
one bug I found is about the jump. before I got the 1st jump power up (dunno yet, if there's a 2nd), I was able to jump multiple times by just holding the jump key. After the power up it works like the jump in any other games = one jump/one button press.