Now that you've mentioned your previous games, I understand why this game is starting to feel like a proper one (your skills & efficiency improve with each new project). Making ALL the assets is an amazing opportunity to create something unique, and that should motivate you. Using existing assets for websites or graphic design was limiting me and I realized later, that's why I started making games.
Working in a team is sooo much better than solo dev! Your 5 stars will always be 5 stars, but both your 5 stars as a team actually deliver 15+ stars, as far as I've seen. Brainstorming before startig the project will help you formulate 70% of the content and mechanics, prioritizing them, so later, if you discover something more is needed, you'll still have time for it, because the priorities are already implemented. Plan & test! Don't just work with whatever comes up along the way and accept it as ok...
[RO] Cu siguranta vom dezvolta niste jocuri bomba, fiindca noi avem viziune si perseverenta. Insa trebuie sa te upgradezi constant, in industria asta am vazut ca nu poti sta comod in aceleasi ape. Succes in continuare!