To be honest, I didn't like your game... I don't exactly know why, but some things come to my mind: the same level can either be too easy or too hard, just because I have the chance to aim correctly without the physics preventing me to do what I want or because the mouse bounces off everything at a high speed; what's more, the number of level is not enough (well, it could have been if there had been something that really changed between them, I don't know...) and the last level looping forever is no fun. Moreover, the game can actually play and win by itself, mainly because the is no way to lose (it seems you changed that on your post-compo version, which I believe is a good thing) ! I don't find the game in its LD48 state very innovative as it's just some variation of pinball with a reduced set of possible interactions, and the theme Escape just seems not to be there because there's no way you could fail to escape as said above... The graphics give me a mixed feeling as they are both colorful and grey, which kind of means both happy and sad to me: the sad grey part is just too serious compared to the cat/mouse story which made me smile. The sound is quite good, a background music would maybe have helped to keep my attention on the game though (a dynamic music would have encouraged me to keep playing and not let the mouse do its thing alone, which also comes from the little control you have on the game).
I give you a four start community rating mainly because of your huge implication in the whole Ludum Dare event, but not five because you didn't really post much related to your game during the compo: an "engine done" and a "game finished" message are not sufficient in my opinion. You could have made bigger progress reports with development screenshots (you only posted one) and maybe a timelapse.
Nevertheless, you made a playable game and that's already something which deserves respect !
If I missed something which seems important to you and may affect the way I rated your game, do not hesitate to tell me as I don't like giving LD games a bad score, in particular when they don't deserve it. If you found my message rude, that wasn't my goal as I hate nothing more than comments which don't help to make things better.
PS: I think that the post-compo version with spikes, lava and stuff like that must be much better than this but sadly for you that's not what we have to rate here...