Garfield?
Excellent game, purr-fect even (sorry)
Loved the game when I got into it (the start was a little hard- but after the 1st upgrade or so it's ok).
But what I'd really like is a map of the level (not revealing the whole thing from the start (too easy then!), but maybe one which maps your progress as you go (if you get what I mean here- so you an only see where you've been.))
Apart from that- you've got the rest sorted; appropriate music that doesn't get annoying, the difficulty is well balanced- providing a decent challenge without being frustrating, and I love the pixelated graphics.
btw- the pic at the end reminds me of Garfield!