Ah happy you enjoyed our game. We were mostly inspired by Fireboy and Watergirl but definitely also took inspiration from other co-op games like "Snipperclips" and "It takes two" to try to make good co-op levels. We initially intended to create more levels and fill all the stars but maybe we should have predicted that that was way too ambitious for 4 days, haha. In the end, we decided to keep the menu select like this because we did not have time to make another one but also because we really liked it. In total there are 7 levels and if you finished them all you should have gotten the "thank you for playing our demo" at the end. Maybe we will add all the levels at some point since most of them are designed, just didn't have the time to put them in :/