Game:

Glowfish (2011)

Duration: 24:01

4,402 views

61

I'll just say up front I really enjoy this game and can't find much in the way of shortcomings. If this looks like the kind of thing you'd be interested in, give it a go. Also, the game does get harder as it goes on, and you even get equipable allies that help you out. There are even boss fights and stuff.

Can currently be found on iOS, as well as Steam. On Steam, it goes for $9.99. I'm not entirely sure if the Steam version is any different than the iOS version.