Great game! It feels perfectly polished and it is an amazing game idea. The puzzles are well thought through and it felt like a true retro arcade. I liked how time is measured in timesteps. The possibility to backtrack your steps made the game easy to try and review. :)
The game strongly reminds me of a Czech game made for MS-DOS in 1993 called Vlak (translates as Train). It had a similar premise. I recommend playing it if this wasn’t inspired by Vlak. :D Also the second level feels like a Frogger reference.
Honestly, great job with this one. Hope to see a full release someday. :)