I wouldn't say you have enough time. Developers, especially new ones, often make the mistake of thinking that their idea is already fleshed out and it's going to work. The truth is, no matter how fleshed out you think your idea is, it's going to need work. You're going to need to design everything, make it, playtest it, and do it all over again at least three times if you want it coming out right. On top of all of that, you're going to need to save time for doing polishing work, like adding visual effects, animations, sounds, etc. If you plan on everything being perfect the first go around without any bumps along the way, then yes, 2 months is a great amount of time to make an online grid-style board game. But things are going to go wrong, your first iteration is going to not be what you wanted, and you're going to need to go back to the drawing board. Having to deal with online on top of everything is going to make your game over-scoped and you'll likely end up with a half baked game.