Take a trip to Mars in a steam-powered space ship and drink lots of tea.
BATTLETECH allows you to take command of a company of mercenary Mech Warriors, fight your way to riches, and esteem to piloting great hulking bipedal war machines armed with exotic weaponry. Oh, and just maybe take down a conniving despot while
Steampunk Tower 2 is a good alternative take on the tower defense genre that mixes various gameplay styles in a successful way. It will surprise you with simple but also deep mechanics and a pleasant style.