Google-calendar – view the mobile version of Google Calendar on the desktop

You can use https://userscripts.org/scripts/show/157979 to color individual tasks that have certain keywords you specify in the script.

Normally reminders are shown in Google Calendar along with events:

and are created in the same way, by selecting "Reminder" on top of the creation dialog:

Troubleshooting:

• Check the list of "My Calendars" to make sure that Reminders are selected there.

• You may be experiencing a transient issue with reminders not showing up in the web version of Google Calendar. (I had this a couple of days ago). If so, all you can do is wait until the hiccup passes.