For the last five hours, I've been working my way through the alternate game modes and I have a minor complaint. Evil Lord 30, Princess 30, and Knight 30 are different games, depending on which graphic mode you use. The game does nothing to warn you about this. So, I initially made it through all three and into Hero 300 in just a few minutes. It was pretty disappointing.
However, once I got things straightened out and realized that there was more game to be had by going into retro mode, I was fairly happy. Each of the three extra modes features a unique character and a fun little mini game. Granted, these characters are super-thin and the games are a bit simple and repetitive, but since they're also really short, none of them outstay their welcome.
The Evil Lord is a vain anti-hero seeking a cure for his bat-ified girlfriend, Millenia, and he gets through levels by summoning three different types of monsters. The trick is to match the monster type to the enemy type in order to proceed as quickly as possible.
The Princess is a meek and retiring damsel who turns into a gung-ho badass whenever she holds her (seemingly ordinary) crossbow. Her game is a side-scrolling shooter.
The Knight, I don't quite have a handle on. He seems a little dim, but his persistence and loyalty get him through many dangerous situations. His game is a series of escort missions, where you have to protect a Sage (who has a bit of a snarky streak) while he casts a magic spell. The monsters in this mode cannot be killed, which makes it more of a puzzle than an action game.
When you beat all these modes, you unlock Hero 300, which is more or less like an especially long level of the normal game, except that you can't rewind time.
Then, when you beat that, you unlock Hero 3, which is clearly the product of a deranged mind. It is exactly like the normal game, except you don't have 30 seconds, you have 3. I can't imagine that I'll ever get past it, and I'm not entirely sure I even want to try.
My plan for the last five hours is to go back into Hero 30 mode and collect all the various items I missed on my first run. After that, I may try Hero 3 a few times, but I'm really hoping it doesn't come to that.