The ingame music is ridiculously close to certain tunes in Aquaria. I guess imitation is the sincerest form of flattery?
Flash game practically stole Aquaria soundtrack
Meh. They copied the descending scale motif that Alec used in several of the tunes, but that's pretty much it. I don't see what the big deal is - it's not like they used the recordings themselves. If anything, I'd take it as a homage.
Yeah, Cheleball is right. Only parts of the music sound like the music from Aquaria, and its small parts of the tentadrill soundtrack. It is interesting that two ocean-based games have that scale bit. It might be inspiration from Aquaria, might not. Anyway though, I don't think its a big deal. Good catch though!