I liked the minimalist style and the sound effects; unfortunately, I’m not very good at demanding platformers and couldn't get past level 2 (that wall of spikes before the gold almost gave me a stroke while trying to get back). Points to consider would be adjusting the difficulty curve and perhaps adding some background music—other than that, it’s a good game.

I like the base movement, the dashing and jumping feels very solid, but I'm really struggling with these levels. The difficulty spike in level 1 -> 2 is jarring. The time limit after getting the gold is really punishing too. It doesn't feel good to mess up once when you're almost back at the door and lose the gold, while you respawn right at the checkpoint you just hit at the start. I also kept having issues with the game just freezing trying to load new levels, even after several minutes (might just be an issue with my browser?). 

As I'm typing this I only just figured out you can dash in any direction?? I thought it was horizontal only until my friend tried the game. So maybe the levels aren't nearly so hard as I thought? Really solid base movement despite my issues with the level design though.

Fun and cute lil' game! Sadly, I'm having skill issues with it, but the movement's really great! Well done.