Unfortunately, space for jump doesn't work most of the time. If I tap S I can't jump at all. Also, if the player eats few powerups collision detection sometimes doesn't work and you fly through the walls. I think it would be better if checkpoints give you bonus time +2 seconds and respawn you only when it ticks down. So if you are precise enough, you can do the level in one go.
Viewing post in 2 == "SPEED" jam comments
When you press the key it makes the player fall faster so maybe that's why you couldn't jump, I'll also have a closer look at why the space key wasn't working sometimes. What level did the player fly through the walls?
I was initially thinking about adding two seconds to the timer when the player reaches the checkpoint but it's always interesting to see what other people think.