That game was super fun!! It took me a while to get ahold of things, and especially how attacks were fractions, I thought it meant it dealt 3/5 of a single point of damage, not 3 points (out of 5... what??)
The gameplay loop is very unique and unlike anything I've seen before!! You made some bold design choices by making powerups limited to once per run, and limiting the player to a set timeframe each run. This really made the game feel tightly paced and suddenly I found myself making careful decisions looking at the risks and wondering if the reward was worth it. It's so fun navigating the mazes, scrounging for runes and fighting the boss at the end of each section to see what goodies lie beyond. It's a solid premise that I'm curious to see how you would expand on. Awesome job!!