Okay, but could use some "oomph"
It's not a bad game, it's just not that exciting. The randomly-appearing items don't help much, either--several times in my first playthrough was there gas behind a rock, so I couldn't reach it.
The fact that the game speeds up after a while is nice, but there isn't any real motivation to move ahead if nothing else changes. Spruce it up with some new obstacles that only show up later on or something; just having the game get faster isn't enough to keep it interesting.
Good job, though! Good luck on your next projects, and if you do end up making the sequel I hope it'll be great.