This was super super solid! I loved the mechanic and how it was introduced, and all the subtle details like the dynamic music, and all of the squishy animations! Really great work! The puzzles were fun and I killed the final boss with a rocket barrage of 4 missiles I sent to the present all at the same time. I think one thing that could have helped is maybe having a few different tiles, maybe to subtlety indicate where the holes in the past and present are. That way you don't accidently keep falling in them when switching.