Nice!
Visuals were great! Very simple but consistent and colorful. I think the parallaxing background was particularly appealing with the little details.
And the music was great too! I thought it worked well, especially with the little musical chimes the characters made when you jumped - I thought they added to the relatively simple background theme.
Gameplay-wise, I thought it was a clever way to mix up the endless runner. Having several runners with different attributes, but being advantageous to switch it up and use several runners instead of just sticking with a favorite. It reminded me of the Pokemon Trainer in Super Smash Bros Brawl.
Also, I really liked the character switch. You very easily could've just swapped a character in but it made it that much better to slow the game down and visually swap the characters with an animation rather than just replacing them.
Couple of thoughts:
- I felt the long-hold for switching characters was a little too sensitive. I found it switching frequently when I didn't mean for it to.
- I think one interesting thing that could be done to encourage switching characters is switching up patterns in the platforming for periods, where the obstacles are easier to maneuver with one character over another.
Excellent work!