Yes, they work fine, although you're going to get uneven weight distribution for each one. I would just get rid of either the incline or decline pushups, I don't know which terms you're using, for which exercise, so I'll just say this; keep the pushups where your feet are elevated, and swap out the ones there your head is higher than your feet with like, dips.
And throw some chin-ups into your workout for good measure.
Oh, and hurry up and get in a gym. If you're going to be working out because you don't have a gym at this moment, then forget what you're doing now. You need to be doing chin-ups, squats, crunches, leg lifts, dips, along with the push-ups.
