Alright, I'm at level 9 now, and I felt there was someone off about it so far.
I have however come to the conclusion that the level design, and learning curve is fine, if maybe a little bit slow-paced, but that being said, that's going to be subjective, and I think it's fine, no one can say it doesn't force you to learn some advanced techniques early on.
What bugs me is the time you spend just.....walking.
I wouldn't want you to make the mazes smaller just for that, as it would compromise the navigation needed to figure out where you need to go.
All I can think of, is that everything, or at least the mouse and cats, could go faster, since if your mouse could run faster, the cats must be given more speedy caffeine to compensate/balance that out. That would cut down on the waiting, and how arbitrilly punishing it feels to lose progress when you have to start from a checkpoint....only to be walking for a full minute...again.
Maybe if there was an adjustable speed slider, it would help cater to everyone.
That's about the only "beta testing" thing I could say, otherwise, everything else feels fun, solid, and engaging, thus far, and it's only getting better as I play.
Edit: After posting my comment, the game had to reload, and I lost my progress, crap. Password system, please?!
Also, I wanted to take a break from it anyway, and I find the lack of a total mute button....disturbing.