Victor, that's an impressive accomplishment no matter how you look at it. Don't allow yourself to spend much time being upset with yourself for things you could've done better, or for mistakes you made. All of your experiences with Unius will serve to make you THAT much more qualified to get a great job once you decide to make your career move.

Sell yourself and your failure experience. I've learned more from my failures as an entrepreneur than I have from my successes. I've learned which mistakes I'll never make again and that's a powerful lesson. The face that you've gone through the process of creating a business that obtained funding and brought in sales and accolades, sets you miles ahead of most people in our industry. It's time bounce back.

I've been EdTech for the past few years now (in similar businesses to Unius), and would love to give you some insights on how I just landed a major career move for myself.

This is naturally a relationship that you'll want to preserve, especially if this client is a family member, friend, or connection somehow. Your first customer's experience can make or break you as you go out and see additional customers. That being said, in my personal experience, the fact that your first client has initiated the conversation of coming on as an investor, is a very strong sign for your business. There are a lot of factors to consider when evaluating bringing on an investor (place more emphasis on the type of person he/she is, their marketplace relevance, access to funds, and connections they have that can be beneficial to you). If taking your initial investment from this first customer means you'll have a direct line into pitching your services to 10 more similar potential clients, then that could be a huge win for you.

In summation, there's no reason you should be any more careful in taking on your first client as an investor, than you should be careful in your evaluation of any potential investor. I'd be happy to chat this through with you further and help paint a more clear picture with more details on your relationship.

Naturally, this question is near to impossible to answer without knowing a LOT more about the business in question. However, when a client of mine is starting a new business, the single most important question I ask them to dive deeply into is if their product/service creates a truly meaningful solution to a need in the marketplace. From there, coming up with a realistic estimate of the size of your target market and gauging exactly how motivated they'll be about purchasing is essential.