Cool game! I like the idea of your speed increasing over time, it makes for a fun challenge.
I agree with Jacob & Nathaniel in that the ground's a little too bouncy, as that threw me off a couple of times Building speed also seems like a necessity to make some jumps, so I'd suggest removing the overhead block near the start - as it stops your momentum.
If you continue to update this game though, I look forward to playing the future versions! I always enjoy speed-centric games.
