Really interesting mechanic here with temporary neutralising the crabs instead of being able to kill them (at least I think that was happening). Was fun to play and I loved the pencil art at the beginning so much and appreciate the fact you used Crustration from secondary themes, made me laugh.
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Yeah, you got it! It's not particularly well-communicated (no tutorial, no in-game text, etc.) but enemies that have been hit can't counter-attack - at least, not until they recover from their invulnerability.
It's a mechanic that I saw in an SNES game, ActRaiser 2, which I thought was a really cool concept. That game has a lot of other things going on (lots of different character actions and movement options) which makes for some interesting decision-making. It was tuned to be fairly difficult and character movement was very slow (from what I've seen, anyway) so I don't know how fondly it's remembered. I know I think it's pretty neat, though!