Add something special for example a gun for players since we need guns every time we wants to play video games to avoid disturbance from adult.

Interesting art direction very simple and does the job. At one point i was immortal and could never lose the game, this felt very empowering as a player, so props for that. 

An interesting idea for the game. Good implementation of the game. It seems to me that the camera is too close to the player. Good job!

Nice game:

Pros:

There were particles.

The gameplay was simple and there were no bugs.

Cons:

You have a lot of health. So It is hard to die, even if you want to.

There should be a walk sound.

I don't think the particles should be the default that Unity gives you.

There should be more features and fixes with the enemies.

Duuude this is so fun to play,  the physics are so cool as well, I really enjoyed it, I mean you even put an easter egg in it (screenshot below) and that is awesome.

Adding music would make it much more alive, and as others suggested going forward you will have the time to update graphics and stuff like that.

But reallly solid entry ... Well Done !!!!

Design is good and clear! Cubes look very clear but if you happen to have time I'd suggest adding some free animated assets!

That's a nice start :) I like the concept.

With some custom models & texture & a punchy music in the background it would look very nice.

You should consider transfering the shoot action on the left mouse button. since you already aim with the mouse it would feel more natural. :)

Good work !

The shooting element is a nice addition to the genre, I also enjoyed the power ups. Had a lot of fun playing and definitely had a laugh when I picked up a power up I nicknamed machine gun, not sure if intentional so I'm posting a screenshot. Well done with the game!