First, I think you should add some sound and music into the game, which make its more fun to play. Second, the game is just more like a patient challenge than a skill challenge, you should make its harder depend on how long the player survived, to the point that you need a "Real skill" than "Spamming". Keep improving, good job!
(some note that: don't blame on where do you live and how long you sleep, there are always have enough time for you, if you work hard)