That was a fun shooter! There was a good amount of juice with the shooting which made it a joy to run around killing like a maniac. I may have been a bit bold (or just bad) because I did receive the message "You died fam" a lot lol. Regardless it was a trip to run through the levels and I feel like the enemies were well spaced and positioned to keep things interesting. Whenever hot mode came on I was like alright time to go berserk! I feel like tinting the screen red or maybe adding some post processing effects could really add to the hot mode feel. All in all I had a blast! Thank you!
P.S. I feel you on Godot exporting to web troubles. This was my first time using Godot and I did my first web build on Sunday and everything was broken. The game ran at like 5 FPS, the lighting was all screwed up and for some reason the floor was pitch black. I lost like 6 hours on the last day just trying to make it playable on web and had to ditch a lot of stuff. One thing that seemed to help me a lot was to change the render driver to GLES2. That made all of my particle effects not work, but at least the ground would render, the lighting would work and it helped with the framerate a little. Not sure if that would fix your web issues, but I figured I would share what helped me.
Great game and great work!