That's a fair comment. Initially I had planned for the game to have multiple stages where the mountain would mutate in a different way each stage (and the player would have to upgrade/mutate in order to compensate), but - say it with me now - I didn't have time to make that all happen.
Thank you for mentioning the performance, by the way - that was another thing I was aiming at from the beginning. I even pulled an old laptop out to profile it so I could be sure that people could enjoy it regardless of what hardware they were using.