This game, looks, sounds and plays great. I have to admit that the original controls broke my mind a little and I managed only over a minute-ish tops. I switched to WASD and it was much more enjoyable and I managed almost 4 minutes. It gets pretty crazy and I like how every run seems to randomize the enemies.
The shrinking play area is something I also explored but decided against as I also anticipated other participants to explore. It still works great in the game and within the theme.
I would only suggest adding a leaderboard :)