My inspirations are based on what's happening with me at that moment in time. My current four games were mostly just done on a whim I guess or at least, that's how I can best describe it.
I can remember one day in the back end of 2013 having this idea for a vertical scrolling shooter games, I was literally able to visualise the gameplay of it and everything. I thought one day "you know what, I'm gonna put this into practice" and my first indie game was born. My strong interest in the mobile world also inspired me to make a mobile version of that game with horrendous results.
My third project draws inspiration from things that are going in real life including a few things from current events (like in the news) while my fourth project... well... is just something I made quickly a pre-order bonus although that heavily influenced by the classic retro game Asteroids (very heavily influenced.)
I also like to use games as a way of expressing myself and in some cases, venting any frustrations so I may end up adding something to a game that may re-enact something similar to what I'm frustrated about and how a certain character gets round it, or I might reference either in a character's dialogue or in some sort of metaphorical way.
Other than that I tend to be inspired by other peoples' games, or even other forms of art or entertainment such as films, music, or pictures. I also like to incorporate various personal interests into my games and I often end up seeing these interests being merged together which can produce either something great, or something awful like the aforementioned mobile game I released. It's kind of interesting really just seeing how everything comes together throughout the development process.