Great game overall (I know it's still in beta, but it feels pretty solid.) One thing I've been having a hard time with is telling the Blue and Purple apart. I personally am blue/purple colorblind, but the two other people I asked had issues as well. Other than that, good game, can't wait to see what all you do with it.
I have three minor things to say:
First: Good game! I am enjoying it quite a bit.
Second: Having a way to make the waves come faster would be appreciated. I spend some time practically afk waiting for waves. Perhaps clicking on the wave could send it?
Third: In the town Watu, it will say "Final Wave!" but never removes the second-to-last's image, or moves the final wave's image forward.
All in all, it's pretty awesome.
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