I like your idea of more detailed grid map. So, wall size is 1 tile, player size 2x2 tiles, attack goes 2 tiles. Its very innovate for me. I've just reach first 2 blob enemies Fighting against 2 foes goes hard. Good job!
Thanks Chekisteg. Players/enemies/etc. all move on tile intersections. It's effectively the same just shifted half a tile so there's a slight margin away from the walls.
I hope you return for the post gamejam release because there are many more (bigger and meaner) blobs to slay!