It's a good, fun little game, and I found myself playing all the levels until I completed it, so you must be doing something right! Some of the graphics seem a little rough, is that a resizing issue? The controls are responsive and generally work well, though I found that the pig can snag on ledges etc. On the last level, the pause button seems hidden behind tiles and I can't click it.
I would like to see some new puzzle/enemy types. It could also do with a quick restart. R key and an onscreen button.
Good job. Especially for your first game.