I can support you with designing creative Google slides deck with right balance between the textual content and complimenting design elements. I will use optimal design elements that will ensure that the core messaging stays intact and creates a good recall value.

Important notes:
# Certain elements cannot be made unique like charts, tables, picture with text layouts etc however other layouts could be made different from one another. If you have any preference on the layouts, fonts to be used etc, please let me know.

# These Google Slides will be compatible with PowerPoint, you can download them as powerpoint decks and use them however there may or may not be minor formatting required if you convert the same back to google slide. This is compatibility issue with Google Slides

# With respect to keynote, this will not be easily compatible, it is an entirely different software.

# There are only limited fonts that can be used in Google slides those that you can see in the Google slide fonts section. Though it will reflect some of the external fonts, sometimes it reverts back to any standard font type after editing or conversion to powerpoint, vice-versa