Really awesome game! It's incredible how well made this is for having been made in a week. Congratulations!
I accidentally failed to see the part where they teach you how to dash and spent some time pressing all keys to find out it was with shift. A shame, and when I reloaded the game it had saved the fact that I was already taught how to dash. My bad of course, it would have been nice to see it on some controls screen or on the game's page though.
I absolutely loved the music and the art. You did a great job at both of them and at making them fit the theme you were going for.
The death counter was a nice touch since it was a hard game, and the levels were short but memorable so that I didn't get frustrated and really enjoyed my experience. Also loved the 1 second window to avoid death, really cool and useful. You made a really good job with that level design. I did think the blue sci-fi style hover board on one of the levels maybe didn't fit the colors too well.
The dash mechanic was great! Felt really good to push enemies off platforms. Its cooldown could've been a little bit smaller, since at some points you are just waiting for that and nothing else. The game teaches you the dash is your only weapon and I thought I could handle the spider and died. Really nice enemy variations though, kept the game fun and interesting. I think I could hear zombie noises even when I had already pushed them off of platforms though.
Another comment is that in the first section the UI text and speech bubble collide with the menu and don't let you click the buttons. Also the speech bubble was a little too big.
Overall awesome game, great idea and execution! Loved it!