Fun idea! It was really satisfying to finally beat a tough level. The visuals, while minimal, are great at conveying necessary information, which works really well for a game like this. I eventually got stuck on level 8 I think, but I really enjoyed the levels I got to (although, the disappearing blocks did get frustrating). In some cases, you might be able to just replace disappearing blocks with sliding ones, to give a better indication of when they'll block you.