Abort game

Sometimes a game starts with good drops for the chosen tactic. But if some needed drops don't come in time it would be nice to just abort the game even if that means no exp. It is quite annoying to sell the strongest towers and click through waves just to lose the game. So maybe add an abort-button on the settings screen?

You can delete a run in the Resume game menu by long-pressing on a game. This only works if you have at least two in-progress games. If your game has at least 30 minutes of playtime, then this let's you submit the game for a score.

What FuzzyEuk says. Also, when you do so, the game will be simulated to the end, so you might get xp for a few more rounds, depending on your defense :-)