The store page says this game has shared/split screen co-op. Were is that?

I've really enjoyed this game. Just wondering if there's any chance of a part 2?

1. Full screen is messed up. It looked fine on first startup but when I tried to change it to something higher, it got a ll blurry. I found out that if you turn off fullscreen and then turn it back on it fixes itself, but then messes up again if you try ti change resolution again. 2. Controller only partly works. It works fine for the main menu (switch from from new game, load, options, exit) and the game itself but it doesn't seem to work on the actual options page. I had to use the mouse to mess with re...

Right now Steam is showing both controllers are present and when he presses Start it does put Player 2 in, but neither of us can control either character. Would like to know if anyone else has any luck so far.

The whole game you can go back to previous areas as much as you like to find powerups and secret areas. Once you beat the game, your file gets labeled as "complete" and now selecting it only takes you to the credits. You can no longer play on that file? You must start a new game? That really sucks. Can this please be changed to save the player right before the final boss?...