I wanna be the Guy(本家)
It's not unplayable but it's not worth your time in my opinion.
It's the root of many fangames, and this is clearly seen. It's the root of the fangames with secrets that are unreasonably hard to find (Dracula's path. Finding this thing by yourself is just terrible. And that to not mention the fake walls and other fun stuff). It's the root of the fangames with huge amounts of flying spikes at the same save (Ghosts and Goblins. Gotta love this stage). But it's also the root of the fangames with good traps. And of the fangames with fake traps. This game has many things that you'll see in other fangames. It even has some needle-ish jumps.
But let's get straight to the point. Everything in this game is a hit-or-miss (Almost always it's a miss). When it comes to level design, you'll find most of the hits at the Fortress of the Guy. The Entrance of the Guy had some awesome visual effects, and was quite intimidating. The Labyrinth of the Guy was frustrating, but it wasn't unfair (As much as it seems like it). The only things I disliked in this stage were the Arkanoid part (Doing this every single time only to die at the next mini-game, where you ride a plane with an annoyingly big hitbox. Totally not boring) and the Final Tower of The Guy (It's boring, and too easy when compared to everything else in the game).
When it comes to bosses, finding a hit is really hard. Mike Tyson is so easy it hurts, and also a bit too repetitive. The green guy is kinda well-made, but way too slow-paced, and you being able to step on these green guys that he throws from his mouth...It doesn't make any sense, how is anyone supposed to know that they don't kill you?!. His intro also takes way too long. Dracula is good-looking, and his attacks are nice, but he's way too RNG-heavy (He's the only boss in the game where RNG might be an issue, actually), often giving you impossible RNG. Bowser is way, WAY too boring, so boring it hurts, as it takes way too long, and the harder parts of the fight will only come at the end of the fight. Mother Brain is boring as well, it has way too much HP and you still have to go through a platforming-ish area before you can reach her, so it also takes way too long. Mecha Birdo is nice, actually, it might not look great but there's nothing bad about the fight itself. The dragon requires mashing if you don't want his fight to take a few hours, and he's just way too repetitive, it's like Kayin ran out of ideas when making him. He throws fire while moving up and down, then he takes enough damage, goes to the other side of the screen, and the same thing happens again over and over until you reach the chase sequence, which is probably the only part of the fight that might be enjoyable. The Guy is quite well-made, actually, but it becomes repetitive after a while, mainly thanks to the part where you have to make his bullets hit him.
That being said, this game has good points, and bad points, so why would it get such a low rating? "Macromedia Fusion [...] has stopped working". Dying 5 times without seeing this screen is very rare. And at the fight against The Guy, it becomes even worse (You don't even need to die, it can happen any time). Also, the controls are beyond bad. It's an old engine, sure, but still, doing a low jump in this game is hell (Try to jump at the height of a gate jump in this game. Seriously. You'll understand). You can only jump at two heights, somewhat high, or really high, and your double jump isn't much better than that. Sometimes, The Kid does double jumps even when you pressed shift only once. And the list goes on.
It might be a decent game, actually, but the bad controls and the huge amount of glitches make this game just unplayable. Wouldn't recommend.
nowadays this game obviously falls behind the newer ones in fact of visuals/leveldesign and pretty much everything you can think of. overall still a fun game in my opinion just because of the huge nostalgic feeling you get from playing it