This game had great mechanics, and I really enjoyed the theme. It's something I don't think I've seen before. The mechanics are something that could have backfired—I've definitely played ones before that were frustrating and finicky with their level design, but this game did a good job of avoiding any jumps or movements that were too picky about positioning.
That said, I also got an out of bounds error after the 12th level (in the web version, Chrome 72.0.3626.121). It seemed like I was at the end of the game anyway, so it didn't really matter too much, unless you had a really cool game end screen.