Bloop is a simple, one button game. Basically, press space when the pink disc is approximately the same size as the white disc. You have a margin of error. The pink disc turns green when it is within the margin of error. In summary, press space when the disc turns green to advance a level. Now for the tricky part. The disc gets bigger, faster, as you advance levels. There are eighteen levels in total. But it's improbable that you will get there. Happy blooping :)
Music credits in project.