I'm playing "The Cave". The cooperative puzzles remind me of Maniac Mansion, thought the gameplay is somewhat different. It's similar to "Lost Winds", but I like the plot and mood of The Cave better.
Oh, and "Four: The Space Fight", the career mode can get really addictive, once you get the controls right. Worth downloading alone to be able to watch the demo in the main screen. And it'd free with no Ads.