The worst thing about this game, by far, is the overabundance of sarcastic reviews littered all over Steam from second-rate wannabe comedians. Please, guys. The joke is old. It's done. It's been made before. Please, let it go.
As for the game itself, my feelings are mixed. Make no doubt about it - the game is flawed. Very flawed. Overall I'd give it a 3.5/10. It had some potential but is very, very rough around the edges.
First things first - the gameplay. The gameplay will be very familiar to people that grew up playing The Incredible Machine. Also, to a lesser extent, it reminds me of Lemmings. You play as the rats, and the ultimate goal is to brutally murder the cat on each level by manipulating a ball. You get access to a number of different rats, depending on the level. Archer rat will shoot the ball straight ahead, vaccuum rat will suck the ball upwards, tractor rat will move the ball slowly forward, etc. You also get access to a few props per level, such as crates, wooden planks, balloons, etc. Once again, this will all be very familiar to The Incredible Machines veterans.
So what's the issue then, you ask? Firstly, probably the most game-breaking issue is the fact that the physics are inconsistent. You can position everything right, but when you press "play", things can still go wrong. Then you can try pressing play again 6 times and 6 different things will happen, even though you haven't moved any of your objects/rats. This is made even stupider by the fact that at the end of each level, you're able to view the "Original solution" (by the developers, presumably), and when you hit "play" on those, a good 50% or more will fail on the first try. Ultimately, it means that each time you create a setup for a level, you should hit play multiple times before changing anything. It's... silly. A game so reliant on physics should not have its physics randomised in this way.
The second gameplay issue is that a lot of the things in the game are clunky. With the wooden ramp, for example, the game tries to angle it at an "ideal" angle depending on where you put it, but this so-called ideal angle often isn't the angle you want it at, and it's incredibly frustrating to try to lie a wooden plank flat when the game decides it wants to be at a 45 degree angle.
The third issue with the game itself is that it's the most unstable thing I've ever played in my life. I've played for a little over an hour and have had the game semi-crash on me 6 times. I say semi-crash, because it doesn't actually kill the game per se, nor does it freeze. Instead, it keeps me in the game but doesn't let me click on anything or scroll anywhere. It's possible that I've actually pressed something accidentally to cause this, so if anyone has any insight on it, please let me know. The issue is worsened by the fact that there is no autosave in this game - a fairly large oversight, given how much sense it would have made to have the game autosave at the end of each level. Fortunately, the game does have a password system which allows you to choose the level you want, most of which you can find online in case you, like me, cannot for the life of you bring yourself to write down a password for each level.
The visuals for the game are... objectively poor. Steam claims the game was released in 2009, but honestly it looks quite bad for a game that was released 10 years before that. Furthermore, the resolutions available are 800x, 1024x and 1240x, all of which look like crap and all of which will leave huge black bars covering approximately 20% of your screen on each side of the screen. The art style is very reminiscent of terrible 90's games, which although objectively looks awful, is kind of my thing, predominantly for nostalgic reasons.
The music for the game is probably one of the few redeeming factors. It's actually pretty catchy and suitable considering how terrible most things about the game are.
Overall, I'd say the game definitely has a large number of flaws, most of which could have been fixed but never were and are unlikely ever to be. It's a shame, really, because despite all its flaws, I actually found myself enjoying what I did play of the game. In other words, I had a better time playing it than I did with some other games that were received a lot more warmly.
Would I recommend it? I'd have to say no, for the most part. Yes, the game is cheap at 99c and often goes on special for 20c and drops trading cards. With that said, on Steam, we are spoiled for choice - Game bundles are rampant everywhere and the main limiting factor for most people now is time, rather than money. As a result, although I'd recommend this game in a vaccuum for 20 cents, I can't honestly say that it's worth anyone's time. For people looking for this style of game, I think that games such as Crazy Machines will provide a considerably better experience.