Very good game! You should add the how to play directions on the compo description too though, rather than just the website with the game. I got confused about what the controls were until I found the controls on the bottom of the website. You should also be able to move with the arrow keys.
This game definitely should be expanded in the future. It has the potential to be a successful game. You should add some catchy music and some power ups and a better main menu screen. Also, when you die, you should not be able to rotate the world and enemies should not be able to continuously spawn and get destroyed by bullets. It will look better if the time was frozen. I liked the "radar" function on the upper left side of the screen which shows where you are and your bullets are. However, I did not realize its function until later on in the game (I actually thought that the "radar" was a separate planet). You should make the "radar"'s function clear from the start of the game. You should also add enemy locations in the radar. Also, I got some bullet issues where the bullets exploded as soon as they were fired, without even hitting robots. Next, there was a glitch in where a robot fell on the floor and was moving. Also, I think the "hearts" in the UI will look better if the inside was fully shaded with the 'pink' color.
This game was very good. I definitely had some fun. I liked the innovation of the "your own bullets can hit you" mechanic. I liked this game's usage of the theme and the rotating world mechanic. The graphics were alright, but nothing very special or catchy. I liked the game's sound effects but there should be some catchy music. There wasn't much humor in this game though. To make it funny, you could make funny looking graphics, but not bad-looking graphics, and maybe funny sound effects or even funny music! Finally, the mood section in this game is pretty good.
In conclusion, this game is awesome!