I wanna take the Timemachine
There are so many bosses, usually you do ~2 screens of platforming before you're instantly put to the next boss. They're extremely learny and pattern heavy and not really fun to play at all. I was going to rate this a 4/10 until I got to the final boss; a long fight where the screen is shaking the entire time. At that point I decided that this is one of the worst games I've ever played.
Cool-looking fangame where The Kid starts in the extreme past and advances further and further towards the future as the game progresses. The platforming is good, although some saves seem a bit out of place, or just meh compared to everything else in the game. There are plenty of secrets to explore, to the point where you might get lost if you're not careful.
Like Boshy, it has a character-switching system. You can become The Guy, Solgryn, Link, Boshy and many other characters, as long as you manage to find these characters and unlock them. There's also an ez-mode with helpful blocks and weakened bosses, but I don't really recommend it, unless you're only playing this game for the K2 challenge, since it skips a lot of pattern from some bosses. And finally, there's a built-in autofire, like in Best Guy, which is perfectly useful even for people who can mash, as you'll need to use all of your focus and fingers to fight against the bosses, not to press X like crazy. You can turn off the autofire at the options if you feel like showing off, but honestly, it's more than just pointless, and will only make the game less enjoyable. If you want a bigger challenge, try Lunatic mode, it's more worth it.
The game shines at its bosses, and there are bosses scattered everywhere in this game. Mini-Bosses and Normal Bosses that keep you from progressing, Secret Bosses (Often found within a secret screen/stage) that will give you new characters, and even The Game Terminators, hidden rupees with mysterious powers, some of them being extremely strong, all of them found within a weird 'secret' point. Every single boss in Time Machine is extremely pattern-heavy and most of them are always moving at huge speeds, despite the huge size of some. The patterns are quite well-made (With some excepetions), but when the bosses are RNG-heavy, things become a bit more...Unfair. That's because, while the patterns are fair and there's always a way to escape (Easier or harder), the same doesn't happen to some of the RNG attacks. Sonic + Mario, and Solgryn, are some great examples of that, they often give impossible RNG at specific attacks, and all you can do is reset and hope that this time you get something doable.
But these bosses have more to offer than just simple pattern and RNG. They're really good-looking, and some of them use their patterns in unique ways, like Ryu, whose floor-destroying attacks will force you to think twice before coming up with an effective strategy, and Sonic + Mario, whose teamwork will force you time your jumps very well. All of that, of course, at insane speeds. Time Machine has some of the most fast-paced bosses I've seen, which is really good because nothing takes too long, something very useful when it comes to pattern-heavy bosses, so that it doesn't take you too long for no reason at all.
The only reason why it doesn't score higher is because of the unfair RNG at some bosses, and because some of the platforming could be better (And because the adventures of the Kid are to save 'her', and 'she' is only shown at the game's intro - an awesome intro, it should be mentioned -, and never again). The bosses are some of my favorite in fangames, and they're one of the best ways for a beginner to start to learn about patterns, as well as to sharpen their reflexes and timing. Highly recommended to anyone.