Neat little puzzle-platformer. I like the premise and characters, but there are a lot of bugs:
• After finishing the 3rd level, I went back to replay the 2nd level because I missed a magic egg. After finding it, then pressing the button to raise the platform for Epsilon, I wasn't able to switch characters. Pressing the shift key did nothing.
• Some of the default controls in the pause menu seem to be incorrect. It says to move with Z/Q/S/D, but it only accepted W/A/S/D to move.
• After pressing Z and Q like above, for some reason Chloe wouldn't turn around when walking; she was always facing right, even if she was walking left.
There also doesn't seem to be much penalty for death. Each character has 3 health, but losing all three of them just moves you back to where you were before, just like if you only lost 1 health. I'm not sure if you were planning on changing this in the future.
Some neat ideas here, but it definitely needs some work. Good luck with this.