Very fun (and challenging!) concept. Trying to play this alone was tough - I kept losing track of which hand controlled which character - but that's definitely part of the game's charm and difficulty.
I really liked the style of the introduction - beautiful art! The background music was also nice!
I played on MacOS and had a few issues with the scaling:
I also had some issues with the controls at times, where a character would seemingly be blocked from going in a certain direction for a while, without any clear indications why (although that may just be me being bad).
The terrain was also a bit hard to read - some parts seemed to be elevated, but I wasn't clear which ones, and where to enter them from.
Overall though, I did enjoy the game! Good job to the three of you! :)