Super polished character controls and animation. I've honestly seen AAA console games that didn't look and feel half as good to play as this! The level design is also very well tuned to highlight your traversal skills
The damage balance between the two attacks was a super interesting mechanic to play around with, especially as someone who tends to find what they like and stick to it, it's refreshing to see a game that goes out of its way to reward you for experimenting with different attacks.
The audio and music suit the look and feel of the game perfectly.
I also really respect the decision to have an option to turn invincibility on. Especially for something like a game jam, people might not have the time to build up the skills necessary for this kind of game.
Only a couple of minor issues. First of all, having the up direction as the jump button always feels wrong, and made the very well implemented wall jumping feel a bit awkward. Having the space bar to jump would have made the traversal aspect flawless.
Secondly, the enemies have too much HP. I understand that, with one of the main mechanics being based around varying damage output, you need enough health for the difference to be noticeable. However, I found that even my fully powered attacks needed 2 or 3 hits to kill even the most basic enemies.
I actually played the game through for a second time, ditching the mouse entirely, and having my right hand on the up arrow as a jump button, just platforming and dodging round the enemies, and it was even more enjoyable to play like that!