I liked the gun design, it reminded me bit of the goofy guns in the "High on Life" Rick and Morty game.
However, I wish there would have been more interactions with the gun, other than the air sucking reload mechanism, to make use of its weird and goofy nature.
For some reason, my mouse sensitivity was extremely high in the web build. Even after turning my mouse DPI to its lowest setting, I found it quite hard to aim precisely due to this issue. Might have something to do with the high resolution of my 4K monitor.
Also, sometimes the enemies got stuck on the walls on their way down, which was a bit confusing.
Even though I get the cel shaded look, I wish there was a bit more detail to the levels, and/or something to convey the direction the player needs to go, as the entryways and exits had the same look – sometimes I felt as I was lost, as everywhere I looked, everything had the same kind of look.
Not bad, but I wish there was a bit more to it.