Could be pretty fun, if you would make the player move faster (the game was just waiting), and it took some time to realize that I could just take the rock and it destroyed the spikes, but after that I could just hold at the edge of the screen to win, I think you should add procedural generation (it should't be that hard if it just chooses from few things to place ahead of you) and make go faster over time + option to manually move it faster (with d or something).