The game is interesting, I like how damage works (that it disables some weapons and is also shown visually).
I also like how the different enemies.
It seems to be working well, I have no big complaints.
Below are some small criticisms.

At one point my score was negative and no opponents came on screen.
At one point an enemy shot a large bullet, which didn't move for the rest of the game.
The controls for entering/exiting fullscreen don't always work.
Basic control screen flashes too quickly to find useful information.
It took me some time to figure out what scrap storm is (at first I thought I could collect the scrap flying by).
When the boss arrives it is difficult to get between the bullets (as the bullets are not flying in a straight line, they jiggle a bit).

The second line was supposed to be "I like different enemies."

A really fun game with great concept.

Below are some criticisms.

I think there should be a way to slightly adjust the placement of a platform - right now if you adjust it, the moment you release, it goes back to the default place.

Also when I release D, the character is moving to the right from inertia, which I think could be smaller.

Bugs:
Collisions - when you are in the corner, if you jump, you will be standing in the air.
Even when I have placed the "jump" block, I can still jump.
I once fell through the map.