What happens if I can't pay back the loan? Would my company or myself be subjected to bankruptcy?

Usually, for P2P, you are required to put 1 guarantor, which would usually be yourself - that means in the case where the company has no funds, you are the one who is supposed to use your personal funds to return. I assume you already know all these - so what happens when you can't pay back?

It depends on the loan amount usually - there is a chance where you will face legal action. it all depends on the amount, and whether the company thinks it's worth going through the legal route to claiming back their money. Either way, your CBS rating (Credit bureau) will take a hit, and you will not likely be able to secure loans in the future.

Secure loan or unsecured loan, in your name, will affect your credit score with Credit Bureau Singapore

https://www.creditbureau.com.sg