Biggest issue is the lack of pixel snapping.
I wandered around for a bit too long before I realized that E started working (I mashed it when I first started, but it did nothing). So, then I had to backtrack a LONG way to go to where the arrow pointed.
Once I got there... I had no idea what to do. I tried a bunch of stuff before giving up.
I feel like you were trying to lead into something, and be mysterious, but honestly the player needs some more direction, and some more information. I couldn't figure out when I could go into the nether, and how I could get into it (jumping?), it was too short. But even then, I still didn't know what I was supposed to do...
The animations were high quality, but lacked some polish (the player jumped off a few pixels before starting the animation, which was jarring).