Fun little game, but i have some feedback:
1. Yes, the characters are joined together, but it would be the exact same game with just one character.
2. It´s a bit too difficult.
3. The music doesn´t sound BAD, but it gets annoying really soon. Maybe try a different synth next time.
Hope the feedback helped you, would be nice if you could check out my game "Square Pair" too. :)