Note that you don't owe the company any loyalty (apart from what could be reasonably expected from a professional), so if the project fails without you, it's no

Note that you don't owe the company any loyalty (apart from what could be reasonably expected from a professional), so if the project fails without you, it's not (and shouldn't be) your problem. If it succeeds, they won't share profits from it with you. Also, you already sort of want to go elsewhere, and you even have an offer you want to take, so you have quite solid plans. What I would do is to explain to the current company your plans and the fact that you would consider staying, but for a substantial raise, and then let the company decide whether to try to keep you.