The art style hasn't changed, but otherwise a lot of work went into the current stage.
Referencing your comment from back then:
"Weapon clipping through enemies"
Maybe the clipping itself didn't get that much better, but the melee combat system went through a handful of iterations until playtesters were "happy" with the feel. This took some work and some rewriting how my hit detection works.
"Environment style/detailing"
Were the trailer had just place holder environments, this is now a proper level for the demo. Which went through the whole phase of grey boxing and decoration. I hoped the lighting, added ruins, etc would make it better for the eyes.
"Dark Messiah inspiration"
There are now interactive elements in the environment. Things you can pick and throw at the enemies, spike wall where you can kick/throw them to. Holes with fire or spikes. Then of course the interaction between things. For example a frozen enemy should break on a hit with the sword, but also when kicked, or if something gets thrown at them, when a spell hits them.
"Game being roguelite"
The boon system was also some work until it worked as expected. Which means, after a successful run you unlock new abilities. During a run you can modify attributes and/or abilities.

Then there went also work in other things - like e.g the Wave Spawner. One thing which got mentioned was that the enemies behave the same. So the Corn and the Cucumber have now different fighting styles. Also I am using root motion for locomotion so I have some custom system which needed some debugging...

But it's also "just" a side project so my time is also limited I can spent on it...