I like the idea of destroying enemies to create platforms, I've not seen it done like this. 10/10 for creativity. Looks simple but nice. I feel like the gameplay could be improved a little though, I didn't personally enjoy being attacked by these glowing red balls and losing health, maybe someone else watching me would lol. I think one shot should be enough to destroy them if I am honest. The gun is cool and like the sound it makes. I'm not sure if you are aware but I thought I should use arrow keys to move as a picture shows them, but is actually A and D.
I've not got far in the game but if you haven't already perhaps you could have another weapon to make the enemies explode to give you lift. Like your ideas. Would be interesting to see what changes you make . Good luck!