The physics of collision is inaccurate - for example, if you fall straight down on a platform tilted at 45 degrees, you should not bounce right back up; your initial velocity will be horizontal. The appearance of the spikes is also misleading; the actual hitbox is a rectangle around the spikes, so you can miss the actual spikes and still die. Other than that, great and simplistic game.
chain reaction games requires absolutely zero skill, and 100% luck. this was basically just a grindfest. and it doesn't even have a good storyline to supplement its lack of any kind of interestingness. 3/5
I find the ball timer rather ridiculous. It should be at least twice as long. Or you should use a physics thing to detect when the ball isn't going to move (i.e. stable equilibrium).