The number of saves selected from upgrade screen will determine how many options will be available to you on the game menu. Press the Escape key in game to bring up the game menu.
Back: Return to the game.
Exit: End the current game and return to the main menu.
Abandon: This button will only appear while playing a side quest level. As these levels do not need to be completed to finish the game you are given the option to abandon the level and return to the world map if you are having troubles completing the level.
Restart: Restarts the current level and bring up the upgrade screen allowing you to swap out gems and select difficulty and number of saves. If you loaded an old save for a new level build, selecting restart will do a clean restart of the level using the new level build.
Keypoint (Keypoint and Unlimited only): Loads the last keypoint saved. A keypoint is saved at the beginning of the level right after the upgrade screen closes. To gain access to the upgrade screen use the restart button.
Save (Unlimited Only): Opens the save screen. Click a save slot to save your game to that slot.
Quick (Under Save, Unlimited Only): Saves your game to the quick save slot. Also use F5 in game to quick save.
Load (Unlimited Only): Opens the load screen. Click a save slot to load your game from that slot.
Quick (Under Load, Unlimited Only): Loads the game from the quick save slot. Also use F9 in game to quick load.
Last (Unlimited Only): Loads the last save. This could be a save slot, quick save or keypoint.
Atomic Hick Software 