Like defense games? Then come play this one. Forever and ever. DefEndless by Mark Dolbyrev and Maxim Yakovenko is exactly what it says on the tin... a tower defense game that never ends. At least not until the enemy plunders all your treasure! When you run out of lives, it's game over with only a high score to keep you company, but starting again will net you a brand new map... with all the upgrades you bought intact!
Taking a page from GemCraft, your towers are actually, well, gems. You'll get three of random colours between each wave to place wherever you like, and they attack whatever comes within range. Enemies will head towards your treasure, hitting each checkpoint along the way. They move faster on the road, but will be forced to go around any gems you put down. While all you have to begin with are a few simple colours, glows around them between stages mean you can click gems to combine them and make more powerful varieties, from simple flawless cuts to towers with special abilities. Refer to the encyclopedia (that's the little book icon at the top of the screen) for the best combination recipes! If things get hectic, you can also use the three magic spells at your disposal to help out. Of course, slaying enemies also grants you cold, hard cash you can spend on more lives, or enhancing the spells you own, or the basic abilities of each gem.
DefEndless, as a tower defense game, is somewhat less developed than its, uh, non-endless cousins and as a result, has a bit of a whiff of repetition about it the longer you play. It still offers a surprising amount of strategy in being able to combine gems into new tower types and drag them around the field, but it also feels like its lacking that undefineable something that makes the games it takes its inspiration from so compulsively playable. Boss fights? The ability to tell the colour of a gem before you place it? More unique enemy behaviours? All those things would definitely have added some oomph, but at the same time, DefEndless can still be surprisingly addictive. It's like the training wheels version of a tower defense game, bringing an almost arcade-like flair to the whole process that makes it perfect for fiddling with whenever you have some time.