As for the comments about the difficulty, we understand it's pretty hard to jump in and survive for a while. If you give it some time, you'll develop a strategy, but I can see why one would lose interest before then.
To address @PowerSpark's comment, agar.io was really one of the last "absorption" games we had in mind when making this. We were really thinking of Spore, Osmos, Bubble Tanks (though that doesn't deal with absorption), and some older flash games.
Your opinion is completely valid, but I just wanted to give my take on it: it seems you're wanting to apply your strategy in agar.io to Envelop, but this game, while sharing some basic principles with that one, has different rules and with them, a different optimal strategy.
Just as a hint to anyone wanting to play who happens to read this: It's true that significantly smaller ghosts will always outrun you. The goal is to find a ghost that's somewhat smaller but mostly still the same size as you. Those ghosts can be caught up to (as they are slow like you) and absorbed. And shooting is extremely helpful, but shoot sparingly! :)