I don't really invest per say, but I do like holding it and treating it as an actual currency so earning it through selling steem for example I quite like and I've already got a cryptocurrency payment process ready on my website for when I release my game.
I've realised I just don't get the amount of money necessary really to properly hold the currency as an investment, that should change this year though for me hopefully.
Would love to hear more about your game when you are ready. Also, we've developed a platform where you can acquire Bitcoin via crowdsourcing on a pay it forward basis with minimal out of pocket expense. You can check it out at www.freewith3people.com. Would love your feedback!