While the game does feel good to play, there are a few massive issues that hindered my enjoyment of it, at least towards the later levels. First and foremost - slide is tied to the CTRL key. On many browsers, CTRL+D opens dialogue to save the page as a bookmark. This meant that if I mistimed my inputs, the whole game would freeze until I closed the popup, and I would then have to restart the level as I inevitably met my demise. Additionally, wall-jumps did not give consistent height or momentum, making it difficult to get a consistent, muscle-memory run pattern going.
However, it's not all bad! The theme interpretation is good, and the tutorial is very well-implemented. The difficulty curve is also one of the strongest parts of the game, and the pacing was solid.
(As for the slide jump issue, I'd recommend tying it to shift instead. Similar keyboard location, easier to reach for most players, and no risk of keyboard shortcut problems!)