I think I just played a crab eugenics game. I also had fun, which might be even more concerning.
The "losing to progress" aspect is pretty interesting in regards to upgrades. I also really like where you took inspiration from. It's funny and weird and great when thrown into a short game.
Some sounds + beach ambience would really improve the experience. There's a bit of an "Oh, come on" zone right next to the crab where I felt like it could have moved its arm back just a little bit to catch a mutated crab that I didn't want going through. I think my crab has a mindset problem. it just needs to believe in itself a little more.
Visuals are cute, I like them especially on the baby crabs.