Interesting concept, but I agree with other commenters - it was hard to understand the goal and what “ON the second” means. It wasn’t also very clear that you can select levels with left/right on the main screen. The game itself is very polished, nice graphics, sound effects, and a lot of small things like particle effects on jumps and collisions, gentle screens shake etc. Cool distortion effect at the bottom third of the screen. One suggestion I have is not to use only colors to indicate something (like red/green to add/remove one second) - use also something else like shape.