Wow. 500 levels? That's an amazing amount of content for any kind of game, and it turns out this is a good kind of game, too. Reminds me a bit of Lode Runner in the way you can dig down and climb ladders. It's a combination of puzzle and platformer, with crispy sprite levels that seem custom made and a TON of content. If only it was a bit easier I'd be stuck on this forever, but it looks great! Nice job!