Stuff like this is why I come to Newgrounds!
5/5
This is a fantastic little game. I'm a big fan of 2-D sidescrollers, puzzle games, and Metroid, in that order. So a game like this is right up my alley.
Graphically, it's deceptively simplistic, and I liked the look. The blurry, confusing opening really drew me in. If I could point out a downside, the game window is very small and some of the larger rooms (and especially the map window) are microscopic. And with no way to make the screen larger, it becomes a strain on the eyes after a while. Otherwise it looks great, particularly the movement of the entire screen as you move - as if you're being watched.
The storyline, at first, is a bit typical of these types of games. But the whole "Mother" element is really unusual and interesting, and worked surprisingly well. The dialogue was well-written, although a sound to indicate new dialogue would have been welcome. And during the final escape, it was difficult to go back and forth from running to reading as Mother kept berating me. But the story and the dialogue worked, it was very clever.
Now, the music really puts it over the top. While it doesn't quite match the cutesy pixelated visuals (a NES Metroid-type score would have been perfectly acceptable if unoriginal), it is so beautiful to listen to that it doesn't even matter. The final escape music fits in perfectly and really adds to the suspense. I could go on about how amazing the music is, but I'll just say go download it like I did! The sound effects match the visuals more closely, nothing too special.
As for challenge and replay value, I didn't find the game excessively difficult in that I beat it twice in 56 minutes. (Once without finding all the letters, then I went back to find the rest and escaped again.) And I got all the achievements without much effort. (The meaning of K.O.L.M. was cute.) I hope if you expand on this or make a sequel, you give players more hidden stuff and a reason to come back again and again.
The controls were smooth and responsive, if a bit slippery, but it gave me no trouble. Customizable controls are always a welcome feature, though.
To sum it up, this is a well-designed, cleverly written and beautiful sounding game. I thoroughly enjoyed it!