Opening Comments:
Well, this is super duper cryptic. Looks like to Bitcoin Blockchain stuff.
Theme: 4/5
It definitely fits the theme in my mind.
Design: 3/5
20 numbers max can be entered, but you told me you don't need to use all 20. In the small box below, the numbers of characters goes 6, 7, 7 and then below those it's 6, 7, 7 again. Hmmmm. ctrl+F didn't help me. I can't solve this.
Audio: 4.5/5
Freaking love whatever this track is. It fits perfectly.
Gameplay: 2/5
Wish there was more to it, of course, and just the tiniest amount of direction. Clarify the small box underneath the browser game? To me, it's obviously a key, but I have no idea how to decode it!
Originality: 4.5/5
This is definitely unique and takes hidden within in a different direction, which I appreciate. I may be biased in that I love any game that uses puzzles!