I've had the Playdate for only a couple of weeks, so I've been searching for new games. Castle Helios has been my favorite game so far. It reminds me of a mash up between Metroid and Zelda II (but far funner and not as frustrating as those games). Definitely had a good balance of finding new abilities and using them to solve the puzzles. I'm being cautious about what I pay for new and untested Playdate games, but this game was well worth the $7.