@Jargon@Jargon Well, what other options do you have? I mean, I think it's a fun little game and I still boot it up every so often just to be reminded of how much better Conzo is than me at it, but there might be better stuff to spend your coins on.
They change every month, but they're usually either stuff I have or have no interest in whatsoever. I remember being at least intrigued in Kersploosh! when it was shown in a Nintendo Direct initially. But it's also only $3, I think, so maybe it's not the most efficient use of coins...
I wrote a review of the game somewhere on the site, for anyone who needs convincing. It's a pretty unique game that is kind of limited by its short length and single focus, but hey, it's a few hours of fun and maybe unlike much else you have played so it is worth a shot.
I can't say if it's worth the coins or not, but I agree with what @Super_Conzo and @Zero say. If you want some high speed high score chasing with a twist you should consider getting this at some point. The game could have used online leaderboards and a wider variety of wells, but what is there is pretty neat. Worst thing about the game, in my opinion, would be the intro sequences for the levels. They're more likely to make me sad than hype me up for playing, but maybe I'm an overly sensitive bore.