@dshimer short answer: yes, because they’re simple.
Long answer: Chromium currently does not have Wayland support. To make it work on top of Mir (a Wayland server), we use an intermediary X11 server called Xwayland, that translates all X11 calls to Wayland.
Xwayland appears to require a minimum GL version of 2.1 to function. Which is a pity as Chromium can actually operate with older GL versions (works on GL1.4 at least) on plain X11, or even fall back to pure software rendering (no GPU at all, uses CPU only).
Most of the mir-kiosk-apps are quite simple, they either don’t use GL at all (render with pure software), or they operate fine with a low version of OpelGL, so they have no problem.
I expect it would be possible to get your setup working with Chromium, but would require tweaking the snap to force Xwayland and chromium to use software rendering only. But then I’m not sure how pleasant an experience you’d end up with, rendering might be slow and jerky. Only way to tell is to try…