A pretty cool game idea that could be really cool with some polish and simpler controls. The sliding wasn't too bad but is a simple thing to remove that could improve the game (still lets the player slide other players and boxes). I got softlocked on level 10 by accidently pushing the box and it slid to an unable to move spot. Also the music was very nice but I had to mute after hearing the character switch sound as it was too loud/sharp. A good concept and I see you plan on making a full version which could add a lot.