In Google Messages you can now respond to messages with any emoji

Google has started to allow some users of its Messages service to respond to messages with any emoji, instead of limiting the choice to seven. The implementation of the function is similar to how it is done in WhatsApp or Telegram Premium - in order to access all the emoticons you need to hold your finger on the message and select the necessary one.

Currently, the feature is available to a limited number of users and the company does not say when it will be available to all users.

Source: The Verge