Hourglass Temple

They say that in a faraway land, there's a place where time runs both ways.

Controls:

Arrow keys to move. Press X to pick up and put down crates. (On mobile devices, swipe a direction and tap the screen respectively.) Press Z to undo your last move, R to restart the level, and Esc to go back to the level selection screen.

Notes:

You can climb steps one square high by walking into them. Falling two squares is safe, even if you're carrying something, but falling three will hurt.

Orange boxes are normal, but pink ones are going backwards in time. If you drop a box off a ledge, then in reverse it looks like it's flying up into your hands. That's strange to us, but perfectly normal to the pink boxes!

If you've seen Tenet, we're doing the scene where the protagonist holds his hand over a time-reversed bullet as if he's just dropped it, and it jumps into his hand on its own. Except instead of a movie, it's a puzzle game.

Credits:

Thank you to pancelor for the level select fork of Puzzlescript.

Thank you to Stingby12, TheZachMan, Karoo, Draknek, and Maltramac for the bug reports - and sorry for the bugs and exploits.

And thank you to knexator for the discussion of time travel puzzle games here, without which this game would not have happened!