The key mechanic of the game is quite fun to use and intuitive once you get it. It would be cool if the resolution was a bit higher on the web version. I encountered a couple of minor bugs, the first is that you can skip most lava etc by just restarting, as you don't instantly die so you can move and restart repeatedly to cross over; the second one is that boxes stack up, which means you may need you to restart the game.
Very fun!