This is interesting. I found the dual gun and shield interesting. You can't shield and shoot in the same direction, which means you are always either defensive or offensive. I also like that the enemies have the same limitation, only being able to attack when they're vulnerable.
There are some technical things I noticed. The instructions (in game and on the page's text) say left button is shield and right button is fire, but it was the opposite for me. Maybe this was a left-handed mouse thing, but I think the instructions should be reversed. The Windows download version is also broken. You only uploaded the .EXE when it needs the .PCK as well. This can be worked around, though, since you uploaded a Mac version. For anybody trying to get the Windows download to work: Download the Mac version as well, copy the file in that ZIP under WISP_Mac.app/Contents/Resources/WISP_Mac.pck to the folder you have WISP.EXE, and rename the .PCK file to WISP.pck. Doing this makes the download work. Also, something I've learned working with Godot, having a "quit" button on the web version is weird because clicking on it kinda partly quits the game. I've gotten into the habit of removing the quit button on the HTML5 versions of my games (which I do in GDScript by removing the button from the scene if !OS.has_feature("pc") ).