Very polished this one, a solid experience through and through. One of the most enjoyable implementations of the theme - swapping between the different states has a really satisfying flow to it, one second turtling up to defend against a barrage of attacks, the next cranking your damage up for a full out assault. The visual feedback for it was very well executed too, having unique sprites for each state, and a very easy to read green to red colour gradient, which also carries over into the enemy design.
I only really had a couple of minor issues with the shooting - the slime trails look awesome, but because they're roughly the same colour as the projectiles, I had a hard time seeing them once I'd been moving around for a bit, and the floow was getting covered. I think this game would also really benefit from a custom cursor - I kept getting my tiny white arrow lost against the floor tiles, whereas a nice, meaty crosshair would really fit in with the aesthetic, and give the player a better idea of where they're shooting.
This is one of my favourites that I've played so far, very nicely done!