Nice, this is an ambitious project and your fresh execution does a good job of cutting through the staleness of typical PowerPoints. I played around, here's some feedback:

- Really like the templates. Lots more would be very helpful so that I can build out a presentation quickly without having to fiddle with detail.

- Top toolbar appears crammed when editing text on a laptop. Tried in both Firefox and Chrome. https://imgur.com/a/fZW7oUI

- You could probably cap the number of presentations in the free tier at about 5 before charging (perhaps a cheaper tier without analytics). Presume you're just trying to get the word out for now.

- Once you've got a good foundation it would be nice to start differentiating with more interactive elements.

Great job, though. All the best!