A simple but interesting game. As a few others have mentioned I think a "retry" button in the game over screen would be helpful instead of having to reopen the application every time. I also noticed how some blobs couldn't be cleaned for some reason. If this was intentional then I'm fine with that but perhaps a different color or shading for the irremovable blobs would help. If it isn't though, then I'll just put this here in case you plan on fixing it or maybe it could help for future games of yours. Still though, this is still a pretty decent game and I commend your efforts!
That is all, have a wonderful day! :D