This game is fun and interesting! I've gotten ending 1 and 5 so far, so there seems to be more than 4.

Oh what did you do to get ending 5 as I've only been able to get endings 1 and 2. 

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Spoilers: Ending 2 is gotten by having a horse and upgrading the horse form at the farm enough. It then gives an option to get ending 2 whenever you want.

Haha I figured that would have something to do with it. 5 involves getting far enough into the farm idle progression and getting all the potion brewery upgrades. It's always so fun to just explore in these games. Yeah they're 'simple' but they're a lot of fun to squeeze endings out of. Same with the alchemist game.

ending 3 involves failing the Darklords fight multiple times and can be selected as the bottom most work on the farm upgrade (no wheat cost)