Pikuniku is an entertaining distraction, a wonderful game world to romp around in. And when you've finished the entire story in a day or three of casual play, you can look forward to restarting it with your inventory intact and exploring all the nooks and crannies to find what you missed before, and going back to finding Ernie, and kick, kick, kicking him back up through the tunnels and back to safety. Tell him I said, “Hi.”
If you're looking for a simple game about jet combat, Sky Gamblers – Afterburner will almost certainly scratch that itch. You don't have to worry about anything other than lining up your shot and not crashing into mountains. I suspect it'll really appeal to those who want to enjoy the multiplayer element where they can take on their friends rather than the simple AI villains who make this game mindless fun.