Grappling hook definitely works best on the second two levels. You can also grab enemies out of the sky with it if you're very clever, but mostly its for swinging around and getting better control. For instance if you have the flag and you are "coming in hot" and going to overshoot your own flag pole, you can use it to try and pull yourself down to the target location.
Zoom definitely should be added, right now there is a sniper rifle which auto-zooms when you pick it up, but in both cases (having no zoom by default, and auto sniper zoom) feels bad compared to "controlling your zoom" -- the main issue is that I've found a lot of problems with trying to use Right Mouse Button in web browser games because browsers really want to reserve RMB for browser function, not pass it through to a game or app easily. So a lot of mouse conventions, like "right click to zoom" are not as simple on the web. Still I can bind it to Z :)
Totally agree the graphics are simple. Part of this is to keep it working at 64x64 scale -- but also I think GPT just isn't the artist that Claude is right now, especially as it comes to animation and "liveliness" of 3d character art.
Thank you for the feedback!