Why don't you just add to the powers you have like in the real visitor, instead of replacing them with new ones. That would make a good game great, although removing some of the challenge, you could give the player a choice on what abilities to develop.
Oh I found out coral.
Coral reef 2.0- Line the bottom with soil [Radius 2], use water draw to half way fill the remaining space, then add the fish. Coral should start growing.
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