This was super fun! Really creative idea, and it was very well executed.
Personally, the player moved wayyyyyyyyy to slow, and it felt like I was trying push an anvil up a hill (although that could be because of lag in the browser. I also wish I could hold W instead of the up arrow, but that wasn't too big of an issue.
The visual tutorial worked super well, and even though this is an asset flip (somewhat) the art worked super well together, and I wouldn't be able to tell if you hadn't specified.
Really great job with this!