Very fun game (I liked it enough to go back and play a second time for a high score), but there are some design choices that are a little odd. You lose more time by missing a shot than by being hit by an enemy, so the best strategy is to stand still and tank hits. The first level is pretty hard, but if you prioritize scaling the time bonuses you get from killing enemies, it becomes trivial after level 2 or so (I ended the last level with almost 1,000,000 seconds on the clock). Also kind of jarring to instantly warp to the menu when you die.
