This is quite a well-designed puzzle game for only a few days! The difficulty progression felt fair, it didn’t overstay its welcome, and it didn’t introduce so many mechanics that it became overwhelming. My main criticism, though, is that the countdown mechanic felt somewhat ancillary. The game was mainly focused around the two characters and switching between them, which I have seen elsewhere (Heroes of Sokoban has a similar conceit, for instance). This game is at its best in the few levels where the countdown mechanic is used in an interesting way, like combining keys. Boxes with countdowns weren’t really used for puzzles at all, which I think was a missed opportunity. This is a good game overall, but there’s definitely potential to go further with it.