It's a bit too simple at the moment, but it's a playable game, at least. I think if you had smaller monsters with a different movement pattern for each monster type it'd be a lot more interesting to dodge them, especially if as the game got harder more show up at the same time. The game could also benefit with keeping track of how long you've survived to give you incentive.

Playable but too simple and gets boring over time. Could be greatly improved with a little effort.