i love the idea of creating conlangs. i’ve experimented with the idea of them in years past but have never done anything with them, let alone created one.
i did create some toki pona-based ones as they consist of few words (~100) but i want to create ones that aren’t just based off toki pona.
To be fair, many words in Esperanto can be linked to Spanish, such as the word “esperi”. However, you could argue “esperi” is influenced by the French verb “espérer” (to hope).
Italian definitely has a stronger influence on the language than Spanish, looking by word roots. However, French actually has an even stronger influence on the language by that metric.
I think the “Spanish” influence you are seeing is primarily from terms which both Spanish and Esperanto borrowed from other languages, especially Latin. It could also be from terms derived from French which you are mistaking for terms derived from Spanish due to the fact they are pronounced with 5 vowels, despite the fact that the relevant words don’t actually exist in Spanish.