"I didn't put my Vita down for nearly two hours. It’s that damn addicting." 9/10 ShogunGamer (Wow, I couldn't have hoped for better than that!)
"sixty second shooter Deluxe is an addicting twin-stick shooter on a time limit and another PSM game that should be added to any Vita owner's library" PSNStores.com
In a nutshell: people dig it.
They do have legitimate complaints, like the game doesn't give you much reason to keep playing other than to beat your own score. I have some ideas how to fix that. (One of which is wait for PSN leaderboards & trophies to become available and implement them.) But until I do fix it, I'd say ... hey, if you haven't scored at least a million points yet, you're not really trying.
And also until then, somebody please post a highscore to the Facebook page. You can own it! King of the hill, baby! What more incentive do you need?