Yes, you can now play Creeper World in your browser. This isn't really news, it's been available for a while but it's still great.
If you've still not played Creeper World (seriously?) and it's because you don't want to download anything or you didn't want to install adobe air or blah blah, then you can play it without worrying about anything. Well, not anything, there are a few loading ads, but it doesn't take long to load.
If you're still not sure, why not read my review and my tactics guide to get a better idea of what it's all about.