This looks nice! How does your product compare with Patreon? (edit:) The difference I notice about it is that this looks a lot less demanding than Patreon. A lot more laissez faire if you will.
Patreon works best for creators with a huge loyal following, those who are most likely to pledge a monthly donation. Small creators find it difficult to raise any money at all from Patreon.
I think it's a decent idea to provide fans with an option of quick one-time payment since many do not like the idea of going through the long process of signing up and paying monthly.
Oh and, https://buymeacoff.ee/nettem :)