There's not much here to go on, but it lives up to its name - there are indeed a lot of shapes!

It seems like projectiles can hit each other, sometimes meaning you only shoot in two or three directions at a time. If your collision system lets you exclude objects from collision tests or has a collision layer/masking system, that might be worth looking into.

It would also be good to get the music looping seamlessly if possible.

I don't feel like a lose condition is necessary, but constraints of some kind would definitely make things feel more engaging.

So far as Linux compatibility goes, your game's binary didn't have executable permissions. If you are on Windows, you may want to consider setting up a Linux environment or using a tool like this one so that you can set the executable permissions that will allow your Linux users to run your game without having to fiddle with permissions themselves.

I wish there was a lose condition, it would make the game more challenging