As soon as I started the game, I noticed that it just FELT right. This game is absolutely flawless, at least to my tastes. It's so simplistic that everything works amazingly, and it escapes the downfalls of similar games by this aspect: With extremely rare exceptions, everything is your fault if something goes wrong, not impassable/unfair obstacles. Also of note is the enemies, which all are well balanced, yet provide an excellent challenge. The simplicity goes farther with the aspect of coins, as this one item acts as a weapon, double jump, cash for buying upgrades, and even very difficult obstacles when trying to not get any. The randomly generated stages all feel fantastic, but I started to notice around level 6 it became nigh impossible to avoid coins without greatly enhanced mobility (e.g. wall jumps, high jumps, double jump, etc.), and sometimes I started the very first stage and could not escape the spawn area at all because the walls were positioned too high. Very rarely does the latter one happen, and that can be remedied by respawning, but the first issue really ruins runs where getting no coins is the goal. That truly is the only issue I have with the game, as everything else is fantastic. I've spent at least 4 hours playing the game so far, and it still hasn't really gotten stale, thanks to it's quality and challenges (especially the no-coins achievement). Truly, truly an amazing game.