I can definitely see the direction you were going with this. I love the concept of solving puzzles.

I have a few notes.

1. The crosshair could've been a simple + or - to help know what firing mode I was in.

2. The game feel is a bit lacking.

3. A simple background music and good sound would've elevated the game a lot.

Anyway, it was really nice trying it. Well done!

unlike others i'm a big fan of the machine gun but i just can't help thinking of green meaning grow and red meaning shrink instead of vice versa

otherwise great work! :)

Oh man, I'm the first one giving feedback^^

First things first, I'm absolutely no shooter player and very bad at 3D jump n runs...so I suck at your game^^
Pretty solid approach to the topic, but imho using magic instead of a machine gun would be better fitting. Good thing is you start with a tutorial, so it was very easy to figure out what to do, right from the beginning.

Edit: Second to give feedback, had the page open for too long and realized after the post