A great puzzle game with an interesting fluid-based mechanic. You have little helpers called Fluros who are both causing mayhem in your factory and who help you fix the problems they cause. You get to work with fluids like water, lava, blue/red goo, and glowing goo, making interesting combinations between them like steam, explosions and manipulating creatures afraid of or attracted to light.
+Good music (though a bit repetitive)
+Challenging puzzles but not TOO frustrating
+Good length. Not too short, not too long.
+Nonlinear within groups of 5-10 puzzles, so if you get frustrated with one, you can skip it and come back to it. Also, there's no requirement to do EVERY puzzle before finishing an area (you can skip one per area and still proceed) but you get bonus stuff for upgrades if you are tenacious and do them all.
+Upgrades. You can upgrade your nozzles and tanks to make your life easier, though most (if not all) of the puzzles are solvable without any upgrades. They just reduce the number of steps you need most times, or the time it takes.
-A few puzzles are agonzing, either because you keep dying (lava creatures who chase you down, mostly) or have to restart because something went wrong with your setup. The final puzzle was torture, mostly because I knew what to do for AN HOUR but I had to keep restarting and setting the whole thing up once more because something went wrong with the execution.
-The way the levels are set up is nonlinear, which I listed as a pro but is also a con. There are some arrows pointing you which way to go, but if you follow them, they just lead you to the end of the level (they're really just there to guide you after finishing a puzzle). You need to follow every path to find all the hidden goodies and bonus puzzles. You also end back up in your lab (the hub) after each area, which has the final puzzle in it, so I spent a good deal of time trying to get the final puzzle to work when I didn't have all the pieces, with nothing to indicate where I was supposed to go next. A bit frustrating. The levels are all connected to each other, with the first one you finish connecting to the lab on the left, so you basically have to travel counter-intuitively and PAST what you've already finished to get to the subsequent areas. Signs would have been nice.
The cons are really just me whining (except for that last puzzle. It was a pain in the ♥♥♥.) Overall, definitely 9/10. I can see myself replaying this when I need a good puzzler. If you like Portal or Swapper, this is for you.