Really well done, congrats on the submission!
For context I played it for maybe 15-30 minutes, here's my feedbacks!
1. The ressources (metal)
I feel like metal/stone is very difficult to obtain once you don't have access to the base island (after few storms). It's mostly due to the fact that you can't stack other structures above the mines that makes it tricky. Basically it makes it so you can't go upward after you placed one *(I simply never found a way :P ). Maybe making it stackable could be done, but then it depends on your design too, this is talking from a player perspective ^^
2. The waves/Structures
I love the wave system, the visuals for them is beautiful and the system is easy to understand. The structures and bricks only have 1 "hp" from my understanding making it very damageable at each storm, you often don't have enough to rebuild them all making a trickier progression. Maybe having 1 more hp as "warning" to make it clear to the player that the structure will fall in the next storm if no protection is given. The wall have that system and I think it's very cool, maybe it could use the same?
Overall, love the execution of the theme with the gameplay! Good job!!
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I'm glad you liked it!
I agree with you about the resources, it might need rebalancing. As for the mines, it was intended that you destroy your mine once it gets in the way or falls underwater and rebuild it somewhere higher, but now I find it a bit weird.
I feel that the whole building system needs a rework, because right now waves are too punishing for the new players, who don't know what to expect from the waves, while building up to the top right corner makes the game too easy.
Thanks for such great feedback!