The menus are clean and simple with a nice colour scheme, and the ability to change resolution, to switch between full-screen and windowed and to change graphical preset was a nice touch. The only thing I noticed was that when I started the game it started in windowed mode, but according to the menu I was in full-screen. All it took was to click the checkbox twice to get to full-screen though, so it's no big deal.
The game definitely fits the theme of chaos. It's very unforgiving and difficult, which isn't intrinsically a bad thing. Just depends on whether or not you like difficult games (I do). I didn't find the controls difficult, but the sudden inversion of them at regular intervals was very disorienting and I sometimes ended up crashing into the ground just because I had difficulty adapting. As far as I could tell there was also no visual queue to show the player that they'd actually hit an enemy (unless I just missed it), and implementing some sort of feedback like that can do a lot for the overall quality of a game.
I think the sound effects chosen for the game were fitting, if a bit repetitive. Especially since the bullets are fired so fast and their sound effect is being played many times in a row. Changing the pitch of the sound every time a bullet is fired to a random number within a certain interval could be a possible way to mitigate this.
The most important part though is that I had fun playing. I tried really hard to survive for a minute, but 46 seconds was the best I could do. I really like the destruction effects when you die or when you destroy the hanging blocks. You mentioned this was your first completed game, and if so seriously well done mate. :)