This is a great little time waster!
But I do have one suggestion...and maybe it's already been mentioned, but I'd like to see a "Warning system" in place to notify you about upcoming mutations / booster power-ups.
If anything, it will give you a chance to align yourself into position to grab them.
The reason I say that is because I found the mutations / boosters came up a little quickly and more often than not, I missed as a result.
Beyond that though, it's definitely an enjoyable game.