I got to wave 44.
The concept is very, very nice and the core gameplay is good, but imo there are some issues on balancing and performance: I had the most fun during the first few waves, because the islands were still manageble, after sometime tho, having 4 islands collide at once on different part of an already big island felt a bit unfair. Also the game started to lag significantly (even reaching 10-5 fps) in the later stages.
As I said, the concept is very good tho and utilises the theme well, good job and good luck :)